Dota 2/Lucifer the Doom

Doombringer is a melee strength hero who is usually played as a carry. He can Devour a creep to gain its special abilities, whether it'd be a stun or an aura. Wiith his Scorched Earth, he can heal himself up while enemies around him slowly burn. His oddly named LVL? Death will do a lot of damage if the target is at the right level, and enemies targeted by his Doom are quite literally doomed, having their health slowly burn away while being completely silenced.

Devour
Devour lets you consume an enemy or neutral creep, gaining bonus gold as well as any abilities that creep has. Usually you would want to Devour the creep bosses in the jungle, as they have better abilities. The centaur, the wildkin or the troll warlord are good targets for most of the game.
 * Ability: Target Unit
 * Bonus Gold: 25 / 50 / 75 / 100
 * Mana Cost: 60 / 50 / 40 / 30
 * Cooldown: 70 / 60 / 50 / 40

Scorched Earth
Scorched Earth creates an area of fire wherever you go, healing you and player-controlled units and damaging enemies for a certain amount. It also gives you bonus movement speed. It's usually used more as a way to escape and heal up than to damage enemies. It is effective for clearing creep waves, so you can use it for pushing, but since it has quite a long cooldown, it might not be a good idea if you don't think you can actually destroy any buildings.
 * Ability: No Target
 * Damage Type: Magical
 * Damage/Regen: 12 / 18 / 24 / 30
 * Radius: 600
 * Bonus Move Speed: 16%
 * Duration: 10 / 12 / 14 / 16
 * Mana Cost: 60 / 65 / 70 / 75
 * Cooldown: 60 / 55 / 50 / 45

LVL? Death
LVL? Death will damage and mini-stun the target enemy, doing bonus damage if the target's level is a multiple of a certain number or at level 25. It is pretty situational for a damage nuke, but if your target is at the right level you can do a lot of damage on a single target. It can also be used to interrupt channeling abilities.
 * Ability: Target Unit
 * Affects: Enemy Heroes
 * Damage Type: Magical
 * Damage: 125 / 175 / 225 / 275
 * Bonus Damage: 20% max hp
 * Level Multiplier: 6 / 5 / 4 / 3
 * Mana Cost: 110
 * Cooldown: 8

Doom
Doom will curse the targeted enemy, disabling all their abilites including most passives as well as items, while dealing high amounts of damage over time. An enemy afflicted by Doom is, well, doomed, as the inability to use spells or items means that they can't use any special methods to escape. The damage over time is enormous, potentially doing a whopping 1050 damage. If there's someone you really want to kill, doom him.
 * Ability: Target Unit
 * Affects: Enemy Heroes
 * Damage Type: Magical
 * Duration: 15
 * Damage Per Second: 30 / 50 / 70
 * Mana Cost: 150 / 200 / 250
 * Cooldown: 110
 * Scepter Duration: 16
 * Scepter Damage Per Second: 50 / 80 / 110

Aghanim's Scepter can be bought by Doom and will increase the duration and the damage of Doom. It also stops the countdown of the duration of Doom as long as he is within 550 units from the target.