Lord De Seis by TimeLord

Level 1:
Deep Pool: Gather 20 Regen Globes to increase your Maximum Mana by 300. Gather 30 Regen Globes to increase your Maximum Mana by 500.
Curse Master: Curse 400 enemies to increase the area of effect of Weaken and Lower Resist by 20%.
Curse Lord: Curse 400 enemies to increase the duration of Weaken and Lower Resist by 2 seconds.

Level 4:
Relentless Spirit: Increase the movement speed of Bone Spirit by 50%.
Essence Tap: Life Tap restores 30% more health to Lord De Seis.
Feeble Creature: Weaken now reduces cursed enemies' basic attack damage by 45%.

Level 7:
Hungry Spirit: For every enemy Hero damaged by Bone Spirit, increase its damage by 3. Damage 30 enemy Heroes to increase its damage by another 90.
Vampire Spirit: Increase the healing of Bone Spirit by 20%.
Selfless Thief: Stolen shields and buffs are applied to Lord De Seis and all nearby allied Heroes.

Level 10:
Blood Pact: 50% of damage Lord de Seis and nearby allied Heroes inflict returns to them as health. Lasts 7 seconds.
Curse of Nihlathak: Fire a long, narrow wave of ice that damages and slows enemies by 50% for 2 seconds. Can channel up to 3 seconds.

Level 13:
Spell Stealer: Increase the power of stolen shields or buffs by 30%.
Prolonged Tap: Increase the duration of stolen shields or buffs by 40%.
Dark Gift: Activate to heal yourself for 20% of your Max Health.

Level 16:
Cripple: Weaken now also damages enemies.
Magic Barrier: Lower Resist causes enemies to have their cooldowns recharge 50% slower for 3 seconds.
Magic Curse: Lower Resist now causes enemies to have -50 Spell Armor, but its duration is reduced to 2 seconds.

Level 20:
Deal With The Devil: Increases the amount of damage returned as health to 80%, and the duration to 9 seconds.
Doom Of Nihlathak: Increases the width and length of the wave of ice by 30%, and the channel duration to 4 seconds.
Spirit Barrage: Bone Spirit now has 3 charges and its cooldown is reduced by 30%.