Dehaka by Taereth

The more damage Dehaka takes from a damage source, the more he adapts to its damage.
For every instance of damage Dehake takes from a source, the next instance deals 10% less damage. This stacks up to 5 times but degenerates quickly after not taking damage from that source.

Dehaka grabs the target, stunning it and pulling it with him.

Dehaka turns invisible, gaining additional movementspeed and dealing bonus damage on his next attack. If he is revealed, he loses both.

Infests a target unit, slowing its movement. If it dies during 5 seconds after getting infested, it spawns a Primal Zergling, that follows Dehaka and attacks the same targets he does. These Zerglings also turn invisible if Dehaka does, but can't be revealed. Killing a Hero with this Ability spawns a bigger, stronger version. Normal Zerglings despawn after 20 seconds, hero-spawned Zerglings only despawn when killed or when Dehaka dies. Maximum of 3 Zerglings.

Dehaka steals the last basic ability that has been used on him, enabling him to use it freely until he dies. Abilities are put on the number keys. Maximum of two abilities.

Dehaka splits up into two Dehakas, that retain 75% of his HP and deal 75% of his damage. Killing one leaves Dehaka weaker until the Ability comes off cooldown. If both Dehakas survive, they merge again after half of the Abilities cooldown.
Both Dehakas are able to use his basic abilities and gain XP.