Pyotr the Portal Keeper by Cuttleboss

Pyotr is a support with limited ability to severely impact the game alone. Despite this, he is quite a powerful hero to help a trustworthy ally. His presence on a team allows the team to be a lot more mobile on a micro and macro level and can mess with enemies that rely on teleport spells or scrolls of their own.
His spells are very disruptive and good with a partner. He can easily slow turn-rate which is good in both lane and in a teamfight. His Nocturne Flash can be comboed semi-reliably with the turn-rate slow. On defense he is powerful with the ability to return to fountain after clashes or during sieges and Warp to teleport allies to safety even if they are stunned by right clicking on them. His ultimate also conversely can destroy the enemy team's ability to teleport into a fight safely. His Shard also allows him to share his superior innate mobility.
When you draft Pyotr, a few things would be ideal to play him to his potential. He wants some kind of aggressive partner that can take advantage of his disables that he can replenish after successful kills with a fountain trip. Though he's able to babysit with his skills, especially Sanctuary Portal, it is not his optimal use. He is good with a splitpusher on his team if he has Shard, since he can give them his powerful passive to use.
As a hero, he plays a bit like a support Underlord or Weaver. There are also similarities with Vengeful Spirit(due to being an agility hero based on positioning), and Puck (due to being a teamfight based anti-mobility hero that relies on Euls+Blink to survive danger)

His weakness is mainly that he is not all that powerful and will struggle if enemies are significantly stronger. Disrupting mobility means little if the enemies can simply overpower you. Heroes with other forms of mobility (like very high movespeed) also can be big threats. He is also not too hard to gank, since his abilities are not great defensively and he is not hard to kill.

Though he is designed as a support who does not really need items to be useful, it might be feasible to play him as a utility core, since he is quite powerful with Blink Dagger and Boots of Travel, he can partner with an initiator to get a Scepter and allow them to stun enemies continuously. With items like Maelstrom he can also be a decent splitpush hero.

Pyotr has some complex mechanics and there is a lot of skill involved in properly using his skills, especially his ultimate. As such Pyotr has relatively medium skill floor but a high skill ceiling.

General Stat Priorities:
High Priority: Mobility, Mana Regen, Movespeed, HP, Mana, Cast Range
Middle Priority: INT, Magic Resistance, Cooldown Reduction, STR, Attack Range, HP Regen, Armor, AGI
Low Priority: Status Resistance, Attack Damage, Attack Speed, Spell Amplification, Spell Immunity, Spell Lifesteal, Lifesteal

For item builds, Pyotr has flexible options in the early game since the items he wants to buy are rather expensive anyway. Due to his passive, he is extremely good with Blink Dagger(due to having low cooldown and penalty time on the item), Boots of Travel (due to the lower cooldown on town portals it is a priority to have unlimited tp scrolls to move around the map without it costing too much), and a distant third Eul's Scepter of Divinity (Due to the synergy with the reduced penalty time of Blink Dagger, it gives Pyotr an insanely powerful escape mechanism and is good interrupt and can set up Nocturne Flash's stun).

Boots: Boots of Speed (usually). Maybe Arcane Boots if you are building certain items or Tranquil Boots if you're broke and need the movespeed.
Laning Options: Magic Wand, Ring of Basilius, Urn of Shadows, Soul Ring, Wind Lace, Fluffy Hat, Headdress, Bracer, Wraith Band

Midgame Options:
General Core: Blink Dagger, Boots of Travel
All Purpose: Eul's Scepter of Divinity, Aether Lens, Force Staff, Aghanim's Scepter
Protection: Ghost Scepter, Glimmer Cape, Aeon Disk, Lotus Orb, Pipe of Insight, Holy Locket
Aggressive: Spirit Vessel, Rod of Atos, Orchid Malevolence, Mage Slayer, Diffusal Blade, Drum of Endurance
Pushing: Medallion of Courage/ Solar Crest, Vladmir's Offering, Aghanim's Shard, Mekansm, Dragon Lance

Late Game Options: Wind Waker, Hurricane Pike, Linken's Sphere, Heaven's Halberd, Scythe of Vyse, Refresher Orb, Boots of Bearing, Guardian Greaves, Black King Bar, Octarine Core, Shiva's Guard, Bloodthorn, Gleipnir, Wraith Pact, Arcane Blink

Neutral Items:
Level 1: Arcane Ring*, Trusty Shovel, Fairy's Trinket, Pig Pole, Tumbler's Toy, Seeds of Serenity, Lance of Pursuit
Level 2: Eye of the Vizier*, Philosopher's Stone*, Grove Bow, Ring of Aquila, Nether Shawl, Pupil's Gift, Vambrace, Bullwhip
Level 3: Ceremonial Robe*, Psychic Headband, Enchanted Quiver, Quickening Charm
Level 4: Stormcrafter*, Telescope*, Ninja Gear*, Ascetic's Cap, Spell Prism, Timeless Relic, Trickster Cloak
Level 5: Force Boots*, Seer Stone*, Book of the Dead, Book Of Shadows, Ex Machina, Mirror Shield, Fallen Sky, Arcanist's Armor
*Denotes an extra useful neutral item

Disorienting Blast is Pyotr's strongest spell in lane. It deals a fair amount of damage and slowing down turn rate limits enemies ability to run away from Pyotr and his partner. It scales well with levels too, so it is the best ability to max out first most of the time.

Nocturne Flash combos well with Disorienting Blast in lane, giving strong kill potential when it is skilled. Flash is also weak in early levels and would benefit a lot from being leveled up. In most cases you would max flash second.

Sanctuary Portal is good as a value point, because it can allow you and/or your lane partner to go home and get a full heal. It is useful to max later on, but early it does its job well enough and it is better to max the two aggressive spells first.

Warp Glyph is powerful not just because it disrupts teleporters but also for its ability to save allies or trap enemies. It should be taken whenever possible to get access to Warp and to be able to push. The mana cost increase is significant, but having it for longer duration and in a larger area makes it worth it.

Attribute Bonus: Pyotr will rarely find a reason to go attributes over his normal spells, since he is not a farming hero and he offers more to his team as a spellcaster. He may have trouble with mana but he can solve that more easily with many item options.


Talent Choices:

Level 10: Mana Regen vs Portal HP. A simple choice. Mana Regen is a good option if you're winning and it allows you to much more easily cast your spells and the bonus Portal HP makes it much harder for enemies to kill it before the team escapes, though has little application if enemies are not contesting the portal regularly.

Level 15: Movement Speed vs Blast Duration. The Movespeed is very nice if you go for a Eul's and Travels movespeed build, which allows you to run at 455 base speed. The Blast duration increase can be powerful against foes that are reliant on turning in combat (usually high movespeed heroes like Bristleback or Leshrac)

Level 20: Blast Turn Rate and Movement Slow vs Doubled Omnipresence. Aggressive disable vs splitpush/mobility talent. The Blast turn rate slow makes turning take many seconds and essentially useless, which means that Nocturne Flash will be very easy to set up, and adds a generous additional movespeed slow which is also very good if the player also got blast duration. The strengthened Omnipresence allows Pyotr and whoever he wants to share his passive with (with Shard) to move across the map even more easily and the reduced blink penalty makes it into a very powerful escape.

Level 25: Nocturne Flash AOE vs Warp Glyph Refreshes TP Scrolls. Nocturne Flash AOE is very strong with Scepter's pulses. This makes it a nightmare of a spell to teamfight into as its AOE gets large. The Warp Glyph refreshing TP scrolls gives strong buyback play potential due to being able to have all allies TP to the glyph to quickly rejoin a push or teamfight. The refreshing scrolls talent can be used as a simple global semi-save by refreshing the scroll at the right time.

Ideal Allies:

Aggressive Lane Partners:
These heroes are powerful laners that partner well with Pyotr and allow him to get kills. With Disorienting Blast the enemies cannot easily turn away when this high damage hero goes on them. They can also refill their health and mana with Sanctuary Portal.

Splitpush Heroes:
These heroes use the Omnipresence passive from Shard well. They spend less time teleporting, can do their next teleportation earlier, and if they rely on blink dagger, the penalty period is shorter so they can get away more easily.

Heroes that Can Make Enemies Face Them:
These heroes can set up Nocturne Flash well, which offers a very powerful potential for chain-stunning, especially with the Scepter.

Global Mobility Boosters:
These heroes combo well with Sanctuary Portal, which can allow one or more heroes that teleport home to come back very quickly after healing up.

Good Against:

Mobile Heroes:
These heroes are very reliant on their mobility spells to get them around and most of them can be killed very easily if they don't have them. Warp Glyph makes their spells not work properly and make them much easier to kill as they will be teleported to the location of the glyph.

Dangerous Channeling Spells:
Nocturne Flash stuns or silences all enemies in the area. A lot of these heroes also rely on Blink as well and Warp Glyph can easily counter that.

Heroes Weak to Warp:
A lot of heroes are weak to their target being repositioned by Warp as it can break their spells. It can mess very badly with their initiation.

Turn-Based Heroes:
Heroes that are countered abnormally hard by Turn Rate slow of Disorienting Blast can find it much harder to use their abilities properly.

Worst Enemies:

Spell Immunity:
None of Pyotr's skills work against Spell Immunity, including his ultimate. Against spell immune enemies he can only use Warp defensively and can do remarkably little else.

Run-at-You Heroes
Aggressive Tanky heroes that can shrug off the teleportation and turn penalties they face by just running and hitting you.

Fast Moving Gankers:
Heroes that can run up to you and blow you up while you have limited ability to defend yourself. They can make Pyotr's game very difficult.

Long Ranged Right Clickers:
These heroes are a lot less vulnerable to a turn rate slow and less likely to be hit by Nocturne Flash (due to its missile speed and limited AOE). Their long range also allows them to easily kill the Sanctuary Portal.

(Design by Vanya Panova, not made for this concept)


Personality:
Pyotr the Portal Keeper is a friendly young man who is curious and looking to learn more, but is also strange by most people's standards. He has a goofy disposition in combat and enjoys himself whenever he casts his spells, and laughs if he misses his spells (Nocturne Flash). He is the adventurous type of character that enjoys the work he is doing. He does not take his job as Portal Keeper as seriously as he knows he should and sometimes slips into moments of seriousness as a result. He is also flirtatious with various girls.

Interactions with Other Heroes:
As the Portal Keeper, he serves Void Spirit loyally and thanks him whenever he can for the opportunity to be the Portal Keeper. His other Hidden Temple associate Templar Assassin has a friendly relationship with him, and he acts very enamored around her. Despite this, he seems to be unaware that Juggernaut and her used to be in a relationship, and will note that she would get along with him. With other girls he is very playful in complimenting them or lamenting the loss of their beauty when they die, though he is strangely unsettled by Marci. He also thinks Muerta is too tragic and odd to flirt with, though tries to bond with her over working with a cosmic being. With some of the burly men in the game like Axe, Dragon Knight and Mars, he calls them dumb brutes and is not impressed by their muscles and shouting, though this may also be a place of insecurity over being thin and not-manly. Pyotr also has some negative but mostly positive interactions with the cosmic characters, like Outworld Destroyer (who he likes), Faceless Void (who he thinks is interesting), Dawnbreaker (who he is all sorts of impressed by), and the Fundamentals (who he likes except for Enigma who he considers the most dangerous of them).

Lore Strength, Classification, and Comparison:
Gender: Male
Age: Early 20s (discovered the Hidden Temple as a young man and has since stopped aging), Early Teenager (Persona, his younger alternate self)
Classification: Magically Enhanced Human
Powers and Abilities: Superhuman physical attributes from the Void (strength, speed, durability), Portal Manipulation, Energy Manipulation, Light Manipulation, Teleportation
Stamina: Limitless (with the Void and the Hidden Temple as his energy source, Pyotr can freely look over all portal activities at all times without concern for his natural human stamina)
Intelligence: Extraordinary Genius (Pyotr was a prodigy of an explorer at a young age, he programmed a robot assistant by altering existing keen technology while still a young teenager, spent years studying town portal scrolls, found the Hidden Temple, passed Void Spirit's test altering the scroll of town portal, and now explores and documents other worlds on a cosmic scale)
Comparable Power Scales: A skilled Cosmic-based mage enhanced by a magical power source
Bane, Leshrac, Outworld Destroyer

Voice Sample:
Based on Yusuke Kitagawa from Persona 5, voiced by Matthew Mercer (who voiced Monkey King in the original release trailer, before being replaced in the actual game of Dota 2). Pyotr's voice is unexpectedly deep for someone of his stature, but is friendly sounding and smooth instead of rough like a lot of Dota heroes. Play Video Pyotr also has a second voice with the Persona set below equipped.

Equipment Slots (7) and Default:
Head: Pyotr's Adorable Do'
Chest: Pyotr's Coat
Shoulder: Pyotr's Scarf
Legs: Pyotr's Legs
Hands: Pyotr's Gloves
Off Hand: Pyotr's Helmet
Taunt: None

Set ideas: PERSONA The Virtuso Explorer

Design by Bongsick

Rarity: Legendary

Before he was the Portal Keeper, Pyotr had gone everywhere with various explorers but took to carving his own path with some keen technology he has altered after studying it in his scrolls. He was equipped for every situation that could arise with his robot assistant, HOBY. When he became the Portal Keeper, HOBY was one of the casualties, who was not able to travel like his master, but Pyotr still misses him on occasion and dreams about these simpler times. Horrific creatures of the Cosmos felt this sorrow and tore this version of the Portal Keeper from a distant timeline so to find a way to free themselves using the future Portal Keeper. Pyotr with his master managed to rescue this younger self. Inai saw the value of this younger "backup" Portal Keeper, and assigned him for training under his "Older Brother". The young Pyotr is glad to have someone looking out for him after being held by these horrific cosmic monsters and the Portal Keeper is just glad to see his old robot friend again.

Equipping this Persona alters the base model of the Portal Keeper. Young Pyotr has a smaller model (being a bit shorter), and is always followed by HOBY. It changes the all icons such as the top icon and minimap icon.
This Persona changes the ability icons as below:
>Disorienting Blast
>Nocturne Flash
>Sanctuary Portal
>Omnipresence
>Warp Glyph
>Warp

The Persona changes Pyotr's missile from the disks above to a laser beam that comes from HOBY.

Sketch also by Bongsick

The Persona also changes Pyotr's voice and Personality. Voice sample below. Based on Albedo from Genshin Impact, who has a softer and higher voice than Matthew Mercer, conveying both his age and his naivety. Played by Khoi Dao. Play Video Unlike his present self, Young Pyotr is more mischievous and curious. Due to his age he is not flirtatious with girls. He also talks to HOBY a lot for guidance, asking him who or what certain heroes are when he meets or kills them.

Standalone Item: Dimensional Dagger
Off Hand: Dimensional Dagger

Based on the Blink Dagger item. Has a special animation when blinking where Pyotr lifts it. When teleporting instead of wearing his helmet he plays with the blink dagger like a butterfly knife.
A real portal master always needs one of these.

Relative Size Comparison:

Thank you for reading my concept. If you enjoyed it, you may enjoy some of my other concepts below:

Cosmic Crawler -A spellcasting hard carry that scales indefinitely-
Galamathet, The Behemoth -A lightning-fast tank and disabler with no fear of mana costs or cooldowns-
Seline, The Aeromancer -A support that excels at re-positioning others in combat-
Fey, The Lash Queen -A very long ranged melee hero with a versatile skillset-
Kurthifa, The Crimson Knight -A carry that weaponizes the power of strength and health-

Additional Reading:

Some other changes the hero concept has had over time:



Credits:
Pyotr's Design by Vanya Panova
Persona (The Virtuso Explorer) Design by Bongsick

Icons (and other visual aid resources) created by the talented artists at TheHiveWorkshop:
Disorienting Blast and Sanctuary Portal Icons by The Panda
Nocturne Flash Icon by Palaslayer
Omnipresence Icon by 67chrome
Warp Glyph Icon by NFWar
Warp Icon by Null
Persona Disorienting Blast Icon by -Berz-
Persona Nocturne Flash Icon by Stempel2000
Persona Sanctuary Portal Icon by Silver-Ex
Persona Omnipresence Icon by Kola
Persona Warp Glyph Icon by Herman123
Persona Warp Icon by General Frank

Void Rifts created by Vinz