Evolution – Corla drains the essence of a Nether Dragon corpse and channels this essence into Twilight Zealots. The Evolution effect then rapidly stacks on the Zealot, and if the number of stacks reaches 100 then the Zealot will transform into an Evolved Twilight Zealot for the remainder of the encounter. The stacking Evolution effect lasts 15 sec.If a player moves into the beam between a Twilight Zealot and the Nether Dragon corpse, that player starts to gain the Evolution effect and begins to evolve. If the Evolution effect stacks to 100 on a player, then the player will transform into a Twilight Drakonid.

Aura of Acceleration – Corla emits an aura that accelerates nearby friendly units within 50 yards. Accelerated units have their movement speed increased by 50%, and their attack speed increased by 15%.

Dark Command – Corla issues a dark command, causing a random enemy player to flee in terror for 3 sec. The fleeing target is also inflicted with 5000 Shadow damage every second.

Twilight Zealot – Two Twilight Zealots are with Corla, preparing to be evolved into Twilight Drakonids.

In Heroic Difficulty, there are three Twilight Zealots.

• Kneeling in Supplication – Twilight Zealots kneel before Corla to prepare for their evolution. When kneeling they will perform no actions, and any damage taken is reduced by 99%.

Evolved Twilight Zealot – A Twilight Zealot that gains 100 stacks of the Evolution effect transforms into a Evolved Twilight Zealot.

• Force Blast – The Evolved Twilight Zealot projects a blast of pure force at a random enemy player, inflicting 6300 to 7700 Physical damage and stunning the target for 2 sec.
• Gravity Strike – The Evolved Twilight Zealot strikes its current enemy target with a magically imbued attack. The strike inflicts 60% of the target's current health as Physical damage, and reduces the target's Attack Power by 2000 for 8 sec.
• Grievous Whirl – The Evolved Twilight Zealot swings its weapons around him, attacking all enemies within 8 yards. The attack deals 7125 to 7875 Physical damage, causes the targets to bleed for an additional 750 Physical damage every 3 seconds for 30 sec. The bleed effect is also removed if the inflicted target becomes fully healed again.
• Shadow Strike – The Evolved Twilight Zealot steps through the shadows and reappears behind his current enemy target. After the Evolved Twilight Zealot reappears, he inflicts 30000 Shadow damage to his target.

Twilight Drakonid – A player that gains 100 stacks of the Evolution effect transforms into a Twilight Drakonid.

• Force Blast – The Twilight Drakonid projects a blast of pure force at a random enemy player, inflicting 6300 to 7700 Physical damage and stunning the target for 2 sec.
• Gravity Strike – The Twilight Drakonid strikes its current enemy target with a magically imbued attack. The strike inflicts 60% of the target's current health as Physical damage, and reduces the target's Attack Power by 2000 for 8 sec.
• Grievous Whirl – The Twilight Drakonid swings its weapons around him, attacking all enemies within 8 yards. The attack deals 7125 to 7875 Physical damage, causes the targets to bleed for an additional 750 Physical damage every 3 seconds for 30 sec. The bleed effect is also removed if the inflicted target becomes fully healed again.
• Shadow Strike – The Twilight Drakonid steps through the shadows and reappears behind his current enemy target. After the Twilight Drakonid reappears, he inflicts 30000 Shadow damage to his target.