Hulkbuster

With: Iron Man, Iron Man (Infinity War)

All Champions: +6% Health.

With: Superior Iron Man

All Champions: +6% Health.

With: Hulk, Yellowjacket

All Champions: +115 Critical Damage Rating.

With: Black Widow

All Champions: +25% chance to Stun with each Special Attack.

With: Civil Warrior

All Champions: +115 Critical Damage Rating.

With: Cull Obsidian

Cull Obsidian: Launching a Special Attack grants a Fury Buff for 4 seconds, increasing attack by 50%. This Buff gains +150% duration while fighting Hero Champions.

With: Hulk (Immortal)

Hulk (Immortal): Personal Stun Effects have +10% increased duration. Hulkbuster: Opponents suffer -10% Ability Accuracy while Stunned.

With: Iron Man (Infinity War)

All Champions: Recover from Armor Break up to 10% faster.

With: Nebula

Nebula: Start the fight with 1 additional Self-Repair Charge. Self-Repair Recharges 25% faster when Charges run out.

With: Sasquatch

Sasquatch: Each stack of Rage increases Wrath of Tanaraq Hulkbuster: Start the fight with an indefinite Armor Up Buff, granting +15% Armor Rating. This can stack above Hulkbusters Armor Up cap.

With: Sorcerer Supreme

Synergy Champions: Armor Break Debuffs inflicted on the Opponent have 30% increased Potency.

With: Spider-Man (Stark Enhanced)

Spider-Man (Stark Enhanced): A.I. Reboots 30% faster. Hulkbuster: +30% Special Damage.

With: Ultron

Ultron: Function (Cauterize) now lingers for an additional 7 seconds after the Special Attack is over. Additionally, While Function (Cauterize) is active, the opponent is Passively Heal Blocked.

With: War Machine

War Machine: +25% Block Proficiency while Blocking Special Attacks. Hulkbuster: +25% Armor Up Duration, Potency and Ability Accuracy.

With: War Machine

All Champions: +130 Armor Rating.

With: Yellowjacket

All Champions: +4% Health & Attack Rating.