Duriel by varkarrus

Level 1:

Cull the Weak: Your melee attacks cleave, dealing 100% damage to non-heroic targets around your primary target.

Sadism: (Quest) Dealing basic attack damage to an enemy hero while under the effect of Schadenfreude permanently increases its healing by 0.1% of your maximum health. Caps at 15%.

Masochism: When taking damage, either reduce it by 15, or halve it. Whichever is higher.

Level 4:

Amplified Suffering: Heal 50% more HP from all sources while at least one enemy hero is affected by Master of Pain.

Minion Slayer: Basic attacks deal 100% increased damage to non-heroic non-structure enemies.

Unscarred: Molt gives you a shield equal to 15% of your max HP.

Level 7:

Lunge: Abduct becomes a ranged ability, causing you to charge at your target.

Meat Shield: Take 75% less damage while performing Abduct, and for 1 second afterwards.

New Flesh: Molt's movespeed bonus is now 60%

Level 10:

Thirst for Suffering

Tomb of Tal'Rasha

Level 13:

Prolonged Suffering: Schadenfreude lasts for an additional second.

Snatcher: Abduct's pull range increased by 40%

Glutton for Punishment: Non-heroic abilities have their CD reduced by 0.6 seconds every time you take damage. Can only trigger once every second.

Torture: Master of Pain's slow increases to 35% over 3 seconds if the enemy remains in range.

Level 16:

Boundless: Move 15% faster while under the effect of Schadenfreude. Does not stack with Molt's move speed bonus.

Splinter Shell: Molt's Decoy explodes when the effect ends, dealing 252 (120+4%) damage and slowing enemies by 30% for 1 second.

Pain Snap: Every second, enemies under the effect of Master of Pain take 169 (80+4%) damage.

Level 20:

Juggernaut: Thirst for Suffering causes you to move 20% faster, and curve towards the cursor. It also has global range, only ending when you collide with terrain.

Maggot King: While Tomb of Tal'Rasha is active, Master of Pain has double range and you take 30% reduced damage.

Act Two: Upon reaching 0 HP, instantly regain 20% of your max health, gain a shield for 40% of your max health that lasts 3 seconds, and activate a fully talented Molt. 100 second cooldown.

Climax: Takedowns while under the effect of Schadenfreude heal you for 30% of your maximum HP.