Ulrezaj by Maximus Ultima

Ulrezaj is an exceptionally powerful Dark Archon born from the merging of 7 Dark Templar, and is controlled by and named after the dominant and most powerful personality.

Ulrezaj is one of the single most potent combatants in Starcraft history. Even among the already immensely powerful Dark Archons, Ulrezaj's power is unmatched, and unlike other Dark Archons, who tend to burn out quickly, Ulrezaj was able to sustain himself through the sacrifice of his cult followers and the absorption of energies on Ehlna. However, despite his longevity and power, he was still very much driven mad by the constant agony all Dark Archons are afflicted with and the emotional turmoil of being multiple people at once.
As a Dark Archon, Ulrezaj drew much of his power from the Void, so much so that he actually leaked Void energies into his surroundings, resulting in the corrosion and scorching of normal matter in close proximity to him. His very presence was lethal.
Due to his immense power, many of his opponents find that evading him and wearing him down over time was more effective than attempting to stand firm against him.

Ulrezaj takes the role of a Bruiser, but is himself designed to counter Bruisers. He is a fearsome foe in CQC and extended fights, but struggles against more flighty foes. Taking him head-on is extremely dangerous. Kiting him out or poking him down is a much safer and more effective alternative.

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Void Corrosion is Ulrezaj's Trait. Each time Ulrezaj damages an enemy, he applies a stack of Void Corrosion. Enemies with Void Corrosion take damage over time, and additional stacks increase the amount of time they take damage for. Ulrezaj also gains Shields from the damage dealt to enemy Heroes by Void Corrosion.
Ulrezaj is largely balanced around this mechanic. Many of his talents revolve around having stacks of Void Corrosion on his targets.

Obliterate resets Ulrezaj's Attack Period and empowers his next Basic Attack, causing it to deal double damage in an area and deal Spell Damage instead of Physical Damage.
Since Obliterate is essentially a modified Basic Attack, it also applies all effects Ulrezaj's normal Basic Attacks would.

Chaotic Torrent shocks an enemy with Void lightning, electrifying them and dealing additional damage over time for up to 3 seconds. If there is another enemy nearby, the lightning will instead jump to that enemy, and can spread to any enemy it has not already hit.
Because Chaotic Torrent lingers on its target if there are no eligible targets nearby, it will deal more damage to a single target if that target is isolated.

Ablating Presence passively creates a damaging AoE around Ulrezaj that also Slows enemies based on how many stacks of Void Corrosion they are afflicted with. Activating this ability increases its radius significantly for 4 seconds.

Maelstrom is Ulrezaj's first Heroic Ability. It places an AoE at Ulrezaj's location that Silences and deals damage in an area for 6 seconds.

Confusion is Ulrezaj's second Heroic Ability. It deals damage in an area and Stuns Heroic enemies and their Summons, but Confuses most other enemy units, causing them to become hostile to everything on the map and attack each other and things around themselves for 5 seconds.

Finally, Voidwalk is Ulrezaj's Special Mount. This teleports Ulrezaj a short distance, dealing damage in an area. This ability has a low cooldown, but its cooldown only recharges while Ulrezaj is out of combat, so he cannot Blink around a teamfight like a beefy Zeratul. This is primarily meant to aid in map traversal, not in-combat mobility.