In Path of Exile 2’s 0.4 meta, the Cast on Crit (CoC) Comet build, primarily on the POE 2 Currency Stormweaver Sorceress, stands as one of the most visually spectacular and powerful endgame spellcasters. It transforms high-crit projectile spam—usually Spark or Frostbolt—into an endless barrage of massive, fire- or cold-infused Comets raining from the sky. Players achieve near one-button mapping with screen-wide explosions, perma-freeze lockdown, and strong single-target bursts that delete pinnacle bosses. This build evolves naturally from league-start Spark setups and scales into mirror-tier investment with insane clear speed and satisfying celestial destruction.

Core Mechanic: Cast on Crit and Comet Triggers

Cast on Critical Strike is the trigger gem that powers the build. It builds energy on critical hits from your main skill and automatically casts linked spells—Comet being the star—once thresholds are met. Comet delivers massive area damage with excellent base scaling, especially when infused. Stormweaver’s ascendancy excels here with lightning/cold synergies, infusion generation, and crit multipliers. Many variants use fire-infused Comets (via Living Bomb or similar) for doubled damage or cold variants for perma-freeze.

High projectile count and crit chance (aiming for 90-100% with tree, gear, and power charges) generate frequent triggers, turning every pack into a comet storm. Snakepit ring variants make Frostbolt fork instead of pierce for overlapping explosions, while Spark provides consistent chaining clears.

Ascendancy and Skills

Stormweaver dominates for its mana efficiency, shock/freeze effects, and infusion nodes like Force of Will and Constant Gale. Oracle or Bloodmage/Doedre variants exist for life-cost or curse-focused play.

Main Skill: Spark or Frostbolt (high hit rate for CoC procs) supported by Pierce/Fork, Unleash, or Control Destruction.

CoC Setup: Cast on Crit linked to Comet + supports like Spell Cascade, Area of Effect, or Infusion consumers (Living Bomb for Fire Infusions that Comet devours for massive multipliers).

Utility: Frost Wall (for crystal detonations), Orb of Storms, Flame Wall, Blink, Sigil of Power, and curses like Elemental Weakness or Conductivity. Infusions add huge temporary buffs.

Playstyle is smooth and automated: Cast main skill to clear packs via chaining/forking projectiles and constant Comet rain. For bosses, layer walls and infusions for burst phases. It feels like one-button mapping once crit and trigger rate are optimized.

Gear, Tree, and Progression

Focus on Intelligence, crit chance/multi, spell damage, Energy Shield (or hybrid to CI), mana, and resistances. Key uniques include Snakepit (forking), high-ES chest, Choir of the Storm or +levels staffs/wands, Atziri’s pieces, and items boosting spirit or infusions. Spirit requirement is often 170-200+ for gem levels and buffs.

Passive tree paths through crit nodes, ES recharge, projectile speed, and Stormweaver notables. Transition from league-start Spark around mid-maps once CoC and Comet are online. Budget versions use basic uniques; optimized ones with double +gem items and perfect ES gear push tens of millions of DPS.

Strengths and Weaknesses

Strengths: Explosive screen-wide clear with beautiful comet visuals, excellent single-target via overlapping triggers, perma-freeze/CC immunity options, tanky ES defenses (often CI for chaos/bleed immunity), and smooth scaling from maps to endgame.

Weaknesses: Gear-intensive for full power (hundreds of divines for mirror), visual clutter in dense fights, mana or life sustain needs careful management in life-based variants, and setup requires decent crit investment early.

The CoC Comet Stormweaver captures the ultimate sorceress fantasy—you barely cast while meteors obliterate everything in sight. In patch 0.4, with infusion and trigger buffs, it remains a buy POE 2 Currency Orbs top-tier choice for players craving spectacle and performance. Stack that crit, link your Comets, and bring the sky crashing down on Wraeclast.