Name: Battle roar
Type: active ability.
Cd: 28sec
Cost: 10% of current hp
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Hero lets a mighty roar, after 3.5 seconds, he is cleansed of debuffs and restores hp and mana equal to 50%(25% for mana) of damage he took. (in those 3.5 sec.).
If you remove more than 1 debuff, allies (in 600 aoe) are healed for half the amount.
If timed correctly it can be a nice dmg reducer vs certain spells nukes unlike raw magic resist. And it also has a way to replenish mana. Numbers can be tweaked.