Level 1:
Unholy Renewal: Unholy Globes now provide 100% more health.
Unholy Power: Increase the duration of bonus Ability Power provided by Unholy Globes to 20 seconds.
Moreina's Essence: Regen Globes increase your mana regen by 0.1 mana per Globe and reduce your basic ability mana costs by 30% for 6 seconds. Collect 30 Globes to gain 200 maximum mana.
Level 4:
Lasting Grasp: Increase the duration of Undead Grasp from 3 to 4 seconds.
Fiery Death: Killing enemy Heroes increases the explosion damage of Fire Arrows by 2. After killing 15 Heroes, increase the damage by another 20.
Sightless Eye: Place a ward that reveals the surrounding area. While standing in the revealed area, Blood Raven gains 5% Ability Power.
Level 7:
Blood Link: Basic Attacks heal you for 15% of the damage dealt.
Undead Essence: Damaging enemies with Undead Grasp restores mana.
Champion Archers: Increase the health of Corrupted Archers by 20%.
Level 10:
Convert: Corrupt an enemy Hero, causing them to attack their allies for 5 seconds.
Burial Grounds: Summon a zombie for each enemy in the target area.
Level 13:
Pyre: Fire Arrows now burn the ground upon impact for 3 seconds.
Fire Barrage: Increases the attack speed bonus from Fire Arrows to 70%.
Deadly Globe: Increases the damage of Unholy Globes by 70%.
Level 16:
Corrupted Horde: Your trait now affects all enemy Minions.
Master Archer: Increase Corrupted Archers damage by 50% and range by 30%.
Reviving Grasp: Whenever an enemy is killed by Undead Grasp, they are revived as Zombies.
Level 20:
Deep Corruption: Increases damage of the corrupted Hero by 100%.
Mausoleum: Increase zombies
Btw do enemies use skills when converted? can they move?
But i would rather have Hanzo or Alleria as an Archer in General.