Hul'Dar by ZeppelinKing

Every 100 damage taken adds a stack of Simply Pain. Activate D to consume all stacks of Simply Pain, and gain invulnerability for 0.05 seconds per stack consumed. Stacks rapidly decay when Hul'Dar has more than 75% of his maximum health.
Each stack of Simply Pain also makes Hul'Dar's basic attacks deal 2% more damage, and heal for 2% of the damage dealt.

Cost: 50 mana
Cooldown: 6 seconds

Swings the Mallet of Azzinoth in a wide arc, dealing 85 (+5.5 per level) damage to all enemies within range. If an enemy is killed using this ability, Hul'Dar heals for 1.5% of his maximum health.

Cost: 60 mana
Cooldown: 15 seconds

Target an enemy. After a 0.5 second delay, project a shield that moves to face in the direction of the target for 2.5 seconds. The shield covers 1/6th of Hul'Dar's hitbox, and reduces all damage taken from that direction by 50%. Loses 40% movement speed while channeling, and moves at 85% movement speed while Pain Bulwark is active.

Cost: 30 mana
Cooldown: 4 seconds

Target an Enemy Hero within melee range to instantly deal damage to them equal to 2 (+0.1 per level)% of their maximum health, and healing Hul'Dar for 2 (+0.1 per level)% of his maximum health.

Every 15 seconds, your next basic attack deals bonus damage equal to 30% of the damage taken in the past 5 seconds, excluding damage absorbed through invulnerability.

Cost: 120 mana
Cooldown: 120 seconds

Hul'Dar reduces his health down to 1%, and becomes immune to all forms of damage and CC for 7 seconds, and is able to pass through units. After the duration, Hul'Dar becomes stealthed, gains 50% movement speed, becomes unrevealable, and heals for 50% of the damage absorbed during the duration over 2 seconds.

Cost: 100 mana
Cooldown: 180 seconds

Hul'Dar jumps to a nearby enemy up to 7 units away, knocks all enemies away and creates a 7-unit wide circular arena which the enemy cannot escape.
During this duration, auto attacks are disabled, and both character's Q and W becomes Stab, a short skillshot dealing 130 damage, and E becomes Dodge, an ability which causes the user to dash a short distance. Periodically, an apple spawns in the Arena which heals the first character to pick it up for 200 health. The Arena is unaccessable by any means, and both people inside cannot be damaged or healed by outside sources.
The duration ends when one of the characters dies, and the winner instantly teleports to their Hall of Storms.

Hul'Dar has 5% more movement speed than most heroes. This bonus is increased by 1% for every 2% health Hul'Dar is missing. When Hul'Dar has less than 15% of his maximum health, he becomes immune to slowing effects.