Passive.
Whenever an enemy hero dies while affected by any of Tidehunter's debuffs or is killed by him, they drop a fish.
Tidehunter can eat the fish to grow in size and permanently gain +3 Max Health, +2 Attack Range, and +1 Bonus Damage Block. Tidehunter also automatically eats a fish on every level-up.?The fish flies 400 units towards Tidehunter upon spawning, stays in the world indefinitely and can be destroyed by an attack from Tidehunter's enemies.
Bonus Damage Block is only applied if there is a source of damage block being applied to an incoming physical attack.