Green Eyes by Hargrim

Toggled Ability
12 Mana/Second

Become Rooted and generate creep at your location. While on creep allies heal for (55+4%) per second, while enemies are slowed by 30%, lasting for 1 second after leaving creep

12 Seconds
0 Mana

Expel liquefied organic matter at a target hero. You lose 10% of your maximum health. If the target is friendly, they gain a shield equal to 10% of their maximum health for 10 seconds, if the target is enemy, they take damage equal to 1% of their maximum health each second for 10 seconds

Unusable while below 15% health

60 Seconds
60 Mana

Spawn a changeling that after 5 seconds morphs into an exact copy of an enemy hero. The changeling can be redirected using the W key. Once morphed, the changeling becomes untargetable by non-heroic enemies and structures, and all enemy AOE. The changeling can move through enemy gates.
Changeling cannot attack and has a timed life of 60 seconds. 

9 Seconds
80 Mana

Contaminate a small area, dealing (180+4%) damage to all enemies in it's AOE, revealing Heroes and disabling non-heroic enemies for 3 seconds

80 Seconds
120 Mana

Morph into an Overseer for 20 seconds, gaining 20% extra vision range and 40% move speed, as well as revealing stealth within your vision range. While in Overseer form Generate Creep no longer Roots you, instead slowing Overseer move speed by 60%

Passive

Mutate ventral sacs, allowing allied heroes to enter Overlord, gaining Stasis and Health regen equal to 60% of the Hall of Storms. Can carry only one hero at a time.
If Overlord dies while an ally is inside a Ventral Sac, that hero will be stunned for 0.5 seconds

Passive

Overlord has no mount ability, and moves at only 80% base walking speed, but can move and see over any obstacles