Blackman and Dabiri by normalice

Level 1:
Grey Area - Quest! Each allied hero healed with Blackman's Arc adds X healing to ally minions with Dabiri's Arc. Each enemy hero damaged with Dabiri's Arc adds X damage to enemy heroes with Blackman's Arc. Reward: When a level 10 talent is selected, the rate that stacks were accumulated for the disabled arc are passively applied to the remaining arc for the rest of the game.
Death Quest - Quest! Heal allies and damage enemies while either Blackman or Dabiri is dead. Every 100 health healed by Blackman or 200 damage done by Dabiri reduces the cooldown of Balance of Power or Imbalance of Power by 0.1 seconds. Quest ends when a level 10 talent is selected.

Level 13 (After 10 there are actually two separate talent trees, depending on which level 10 talent is taken):
Conquer the Shadow taken
Dark and Light - Balance of Power can be reactivated within 3 seconds to swap positions.
Dark side - Balance of Power also heals for the difference in health
The Draw of Power - You are always unstoppable when moving towards Dabiri for more than one second. Effect is canceled immediately if you stop moving or are not moving towards Dabiri.

Vanquish the Reavers taken
Brightness - Each active minor archon increases vision radius by 15%. When three or more archons are active, you can see over terrain.
Worthy Sacrifice - As long as at least one minor archon is active, Imbalance of Power can be activated while stunned to destroy a minor light to instantly remove the stun and all other movement impairing effects.
Speed of Darkness - Pull of Darkness movement speed increased by 500% and passes through terrain. Damage increased by 20% for each unpassable terrain passed through.

Level 20:
Vanquish the Reavers upgrade: also consumes enemy globes, destroying ally minions.