Help! Battle pass quests

Damage enemy heroes 10/15/20 times with a minimum of 100 magic or pure damage within 10 seconds.
I don't get it.English it's not my mother language and i don't quite understand the logic behind this quest.What do i have to do exactly?
Thanks.

You have to deal at least 100 magic or pure damage to someone 10 times in 10 seconds. So like a Freezing Field deals it's damage in multiple explosions right, so if you hit someone with 10 of the explosions in 10 seconds, you can complete the quest. ( 1 star at least )

Basically you need a hero who can deal multiple instances of 100 magic or pure damage quickly.

Hopefully I explained it well enough, sorry I couldn't be more detailed.

Good heroes for it are Leshrac, Crystal Maiden, Sand King, maybe outoworld devourer etc, heroes who can do a lot of bursts of damage.

I think Zeus works well, whenever you use your ultimate you do over 100 magic damage and since you can spam his spells they may also help.

Timbersaw is great. Everything he does is just deal pure damage.

I completed it easily with zeus