Jaraxxus by Caleb

Passive

Each of Jaraxxus' abilities can be cast up to three times, when on the same person the effect is multiplied.

Each of Jaraxxus' abilities grant stacks of their effect that persist for a time. Characters can have multiple stacks at a time, but can only have 3 stacks of each ability active at any time (for a total of 9). While multiple stacks of the same ability are in effect, the effects of the ability are additive. If a stack is granted while there are still 3 of it in effect, the oldest stack of that type will immediately expire.

Charge Cooldown: 5 seconds (max 3 charges)
Duration: X seconds

You inflict an enemy with damage over time.

Inflicts an enemy with a stack of Legion Flame that deals X damage over time (+X per level).

Charge Cooldown: 5 seconds (max 3 charges)
Duration: X seconds

You reduce the amount of healing an enemy receives and decrease his damage.

Inflicts an enemy with a stack of Incinerate Flesh that negates the next X AMOUNT (+X AMOUNT per level) of healing received and decreases damage dealt by 10 percent (+X% per level).

Charge Cooldown: 5 seconds (max 3 charges)
Duration: X seconds

You boost an ally's ability power.

Grants an ally (can be casted on self) a stack of Nether Power Each that boosts ability power by 10 percent.

Cooldown: X seconds
Duration: X seconds

You create a Nether Portal which summons increasing powerful minions to push lane.

Creates a Nether Portal at a target location (global cast range). The portal periodically summons demons, summoning stronger demons as time goes on. Starting out with some voidwalkers and imps, followed by succubi and imps, followed by felhounds and felguards, followed by doomguards and mistresses of pain. Lasts for X seconds or until killed.

Cooldown: X seconds
Duration: X seconds

Infernals rain from the sky.

Infernals fall from the sky across the map doing area damage upon landing, and wanders a short distance around the spot he spawned attacking all enemies that come near.