Mission 21 (Final Battle) prioritizes sustained aggression: preserving kill streaks between zones unlocks a plasma-like superweapon when the combo meter maxes out. This charged attack annihilates foes instantly, dramatically accelerating progression.

Maintaining momentum is critical—interruptions could triple mission duration. Target three Hellgate generators, eliminating foes efficiently at each site. Weapon upgrades at generators simplify encounters, letting players bypass secondary objectives for pure combat focus.

Confronting The Primordial Titan

Generator destruction triggers a colossal clash against The Old One. Employ sustained combos and siege cannons for maximum damage. Boss health depletion may not immediately end the encounter—continue assaulting until scripted sequences conclude.

Ahzrak Ascendant: Initial Confrontation

Engage Enhanced Ahzrak using shotguns for predictable patterns and health drops. Perimeter movement secures armor refills while chain shots maintain pressure. Avoid rocket launchers despite their power—inconsistent accuracy prolongs the battle.

Melee strikes prove deceptive, often creating distance without damage output. Prioritize destroying crimson priest walls—their arrival empowers the boss or triggers deadly area effects.

Ahzrak Unleashed: Aerial Onslaught

The winged phase introduces thermic spikes—neutralize them rapidly with shield throws to prevent explosive hazards. Perfect parries remain essential for creating attack windows and mitigating damage. Impaler mastery attempts yield uncertain results during this sequence.

Ahzrak’s Final Form: Endgame Strategies

The ultimate phase features orbital strikes from crimson idols—timely parries neutralize these threats. During landing sequences, deflect jade projectiles back at Ahzrak while maintaining chain shot bombardments. Crossbow usage provides supplementary damage despite limited efficiency.

Victory triggers narrative sequences bridging to Mission 22. With no collectibles present, full mission completion unlocks immediately post-battle.