Diosin, wrathful legionnaire

Diosin is a hero that is going to clear the team fight trash. Halfway through a team fight he is going to pop out of nowhere and screw everyone's **** up before rushing a push. But be careful, timing is the success to this hero, he seems pretty straightforward but making a careless mistake is really going to screw you over.

Lore:
Diosin was once a noble hero who fought evil. However, after many journeys, he encountered the screaming demise. The sword was so corrupt, when its blade merely touched the once clean contenant river of Zion Jr, a quarter of its rivers and life immediately turned into the blood that the sword had shed before. Quickly succumbing into the sword's powers, Diosin immediately became an insane, blood thirsty champion, hell bent on slaying all enemies.

Stats:
28 + 2.95
24 + 2.5
28 + 2.7
Attack: 50-57
Woahwoahwoah, hold your horses, before saying this guy is op, we need to look at his skill set first. The high int is actually his weakness, more light will be shed on this as we go on...

Skills

Maddening battle cry
Diosin lets out a deafening cry that drives himself and all units under him to be in a complete state of frenzy, causing him and his units to be impervious to damage and move at maximum speed for .75/1.5/2.25/3 seconds. This spell has no mana cost, but it uses up 25% max Hp to cast. If Diosin is below 50% health, the spell will cost 60% of his current health.
Cooldown: 40/34/28/22 seconds.

Screaming demise(passive)
The blade makes an ear-piercing shrieking sound whenever it cuts through armor and flesh, making even the most valiant enemies unable to fight by silencing them. The blade's insatiable hunger for blood also absorbs the life out of the person under attack for Diosin to feast on, increasing his viatality.
15% chance to silence enemy unit for 2/2.5/3/3.5 seconds for every successful hit.
20% chance to heal back 7/8/9/10% max health for every successful hit. If the hit is dealt under the effect of executioner's feast, the heal is confirmed.

Summon Familiar horrors
Diosin forms 1/1/2/2 manifestations of his dark side. These manifestations are hero units but they will deal only 10/20/30/40% damage and they only have 30/40/50/60% -50/75/100/125 hit points. These units have phased movement. They require 50% max mana to summon. And they give 130 gold when killed. Cooldown 120/100/80/60 seconds
Note: they are not images, which means they do not die when mana leak is cast on them/ no bonus damage when hit by arcane orb, etc etc. Also, there can only be a maximum of 4 manifestations at one time)

Executioner's feast
Diosin uses a random nearby creep within 300/400/500 AOE as a catalyst to travel to another target creep at a global scale along with any unit he owns. Both creeps die by the end of the teleportation. When teleported, Diosin and his units receives a buff. The next attack he or any unit under him deals will be 2/3/4 x the normal damage. This attack ignores any kind of armor. If a enemy hero is killed under this effect, maddening battle cry's Cooldown will be refreshed and Diosin receives back the mana used for the casting of this spell.
Costs 25% max health of all units under Diosin and Diosin himself as well as 50% of diosin's max mana.
Cooldown 100/70/40 seconds.

Sooooooo... why exactly is the high Intelligence bad for him?

'Summon Familiar Horrors' and 'Executioners Feast' are the only skills that use his mana and both take 50% of his maximum mana, that way it doesn't matter HOW MUCH Mana or intelligence he has.
Even with only 1 Intelligence he could cast his spells (1 Int = 13 Mana, 50% of 13 = 7.5)

At Full Mana he will have enough to cast both skills, which also have very large cooldowns (60 and 40 seconds at max level).
Everything his high Intelligence grants him is high Mana regeneration for a Strength hero.

Only when he is Mana drained below 50% Mana (there aren't that many heroes who can burn mana without Diffusal Blade) he will not be able to cast these.
And the only Spell i know of, that base on enemy intelligence is Outworld Devourers Sanity's Eclipse, and that is based on how much LOWER the enemys Intelligence is.


Please enlighten me, maybe I have missed something important, although I read over it 2-3 times while writing this.

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Aside of that, this hero really seems to be a "high risk, high gain"-hero because of his HUGE Health loss through his abilties.
Like when he activates both his 'Executioners Feast' and 'Maddening Battle Cry' when arriving at the battle, he already lost 50% of his Health WITHOUT BEING TOUCHED(!).

In that case when I woul be his enemy and i see his Battle Cry, I would turn around for 1-2 Seconds until he is damagable again and stun him, and then focus him down before he could heal himself back up with his 'Screaming demise'.


Detail questions:
Could you have more than 2 Familiar Horrors, when casting it again, or will the older ones replaced? - Like summon 2 and summon another two one minute later, so that i got 4?

First off, the high intelligence is completely unnecessary. Yes, but high intelligence means high mana pool. With spells that demand 50% max mana wouldn't someone with higher mana regenerate mana slower? thus if he has a large mana pool, there won't be a backup plan for him to do another maddening shriek. Also, high intelligence and an unnecessary mana pool = manaburner/anti-mage food. yea sure, there's the outworld destroyer ulti, but that's about it.
But now that i think about it... wouldn't it be better if he starts with very high intelligence and then instead of gaining intelligence, he loses it? that would coincide perfectly with his whole madness-insanity theme.
On the teamfight thing, he is meant to be the guy who clears the trash, instead of appearing early, he appears midway when almost everyone has exhausted their stun. that's why timing is crucial for this hero.
Only 4 manifestations at a time

High-risk High-reward alright :P.

Also, how long do dark horrors last?