Mephisto by JLE1138

Level 1:

- Unlimited Power (Q):

Collecting a Regeneration Globe grants a stack of Malevolence. (?) Quest: Collect 20 Regeneration Globes. (?) Reward: Jolt's active cooldown is decreased by 0.5 seconds per enemy Hero it hits.

- Drain (W):

When cast, Hate's Curse's active cooldown is reduced by 1 second for each stack of Malevolence Mephisto has.

- Abhorrence (Active):

Activate to reset the cooldown of the last Basic Ability you cast, but reduce the damage of its next cast by 20%.

Level 4:

- Conduit (Q):

(?) Quest: Stun 5 enemy Heroes with Jolt. Progress is lost on death, or when Mephisto fails to hit an enemy with Jolt. (?) Reward: Permanently increases Jolt's damage by 40, and decreases the Malevolence stacks needed to Stun by 1.

- Hell Freezes Over (W):

(?) Quest: Dealing damage to Heroes with Hate's Curse increases the slow time by 0.05 seconds, up to 0.75 seconds. (?) Reward: After damaging 15 Heroes, whilst at 5 stacks of Malevolence, Hate's Curse instead Roots the target.

- Deathly Cold (E):

Damaging an enemy with Seeking Skull resets the Slow timer on Hate's Curse, and increases the Slow amount by 15%.

Level 7:

- Surge Charge (Q):

Hitting an enemy Hero with Jolt grants a shield equal to 5% of Mephisto's Maximum Health for each stack of Malevolence he has.

- Crushed Spirit (W):

Basic Attacks against enemy Heroes affected by Hate's Curse restore 5% of Mephisto's missing Mana per attack.

- Seethe (Trait):

Mephisto's Mana regeneration is increased by 10% for each stack of Malevolence he has.

Level 10:

- Hatred (R):

After 0.5 seconds, deal 240 (+4% per level) damage to the Hero that has dealt the most damage to you in the last 5 seconds.

- Malediction (R):

Activate to consume all current stacks of Malevolence to make Mephisto's next ability deal bonus damage equal to 4% of the first Hero hits Maximum Health per stack.

Level 13:

- Visible Fear (E):

Seeking Skull's damage is no longer increased by Malevolence, but instead reveals the Hero hit for 2 seconds longer per stack.

- Headshot (E):

Seeking Skull does bonus damage equal to 10% of the Hero's remaining Mana. This damage is not affected by Malevolence.

- Channel Enmity (Trait):

Activate your Trait to consume all stacks of Malevolence, to gain 10 Spell Armor per stack of Malevolence consumed for 5 seconds.

Level 16:

- Storm (Q):

Hitting an enemy Hero with Jolt triggers a bolt of lightning to bounce to 3 nearby enemies, dealing 124 (+4% per level) damage.

- Anamnesis (W):

Increase the time able to deal damage with Hate's Curse by 3 seconds.

- Hate Knows No Bounds (E):

Seeking Skull's damage is no longer nullified if out of Mephisto's intial vision.

Level 20:

- Loathe (R):

After taking no damage for 5 seconds, Hatred becomes targetable. Hatred's cooldown is reduced by 50% when used this way.

- Eternal Damnation (R):

(?) Quest: Consume 50 stacks of Malevolence by using Malediction, including ones already consumed. (?) Reward: Malediction's cooldown is reduced by 100%.

- Dead Rising (E):

Seeking Skull now sends a skull to each enemy Hero, but its cooldown is increased by 8 seconds.

- Lord of Hatred (Passive):

Malevolence stacks last for twice as long.

Thanks a bunch for looking through my concept. I hope you enjoyed reading it as much as I liked making it.

If you have time, I'd be chuffed if you checked out my other concepts below:

- Vol'jin (Warcraft Melee/Ranged Assassin)
- Duriel (Diablo Melee Assassin)
- Imperius (Diablo Warrior)