Summoners War Cosmic Worm Guild Siege Offense Guide

To use Cosmic Worm successfully in Summoners War Guild Siege offense, draft it into slow stall or bruiser defenses and pair it with dedicated immunity and sustain supports. Because Cosmic Worm relies on surviving multiple turns to ramp up its combat scaling, avoid drafting it against explosive single-target nukers that can eliminate it on turn one.

Team Compositions and Supported Teammates

Cosmic Worm supplies its own scaling damage over time, meaning its two supporting slots must focus on defensive survivability, debuff removal, and healing. Incoming defense breaks, heal blocks, and hard crowd control will prevent the Worm from surviving long enough to ramp up.

Pairing Cosmic Worm with an immunity buffer like Woosa or Delphoi prevents enemy control teams from locking it down. When facing heavy passive compositions, bringing a disruptive bruiser or passive blocker like Tesarion draws enemy target selection away from the Worm, securing the turns needed to build maximum stats.

Defenses to Target and Matchups to Avoid

Deploy Cosmic Worm into defenses that rely on drawn-out attrition rather than rapid burst damage:

• Dual Healer and Stall Towers: Target compositions featuring multiple sustain units or revivers that lack the raw damage to threaten your team's health pool.
• Predictable Single-Element Defenses: Attack teams where the enemy's elemental target selection can be manipulated using a specific elemental tank, keeping the Worm unharmed.
• Control Defenses Without Nukers: Attack speed-oriented control teams that lack execution power, allowing your cleanse-and-heal engine to outpace incoming damage while the Worm stacks.

Matchups to Avoid: Do not draft Cosmic Worm into teams featuring high-tier ignore-defense threats such as Covenant, Kahli, or Sonia. If the defense can deal lethal damage on turn one, Cosmic Worm will fall before its scaling mechanic alters the fight.

Rune Builds and Stat Priorities

Cosmic Worm requires high baseline bulk to ensure it survives initial defensive volleys.

• Primary Rune Sets: Violent/Will is the preferred setup. Bonus Violent procs directly accelerate the Worm's ramp-up speed. If Violent sets are unavailable, Despair/Will provides crowd control utility across extended fights.
• Main Stats (Slots 2/4/6): Run Speed on Slot 2, with HP% and Defense% on Slots 4 and 6.
• Substat Priorities: Prioritize Effective Health (HP% and Defense%) first, followed by Speed, Accuracy, and Resistance.

Initial offensive stats are secondary, as the monster's passive scaling compensates for low starting attack power as turns accumulate. Will runes are mandatory to protect against turn-one debuffs before your supports take action.

Turn Order and Battle Execution

1. Open with Defensive Buffs: Ensure your support unit moves first to cast immunity, defense buffs, or shields before the defense can land armor breaks or skill resets.
2. Absorb Opening Cooldowns: Let the opposing defense waste its primary burst skills into your protected team while Cosmic Worm takes its initial turns.
3. Eliminate Primary Threats First: Once enemy cooldowns are spent, direct the Worm's attacks toward the enemy’s main damage dealer or defense breaker.
4. Preserve Healing Cooldowns: Rotate sustain abilities steadily rather than burning them prematurely. Once the opposing damage dealer is eliminated, Cosmic Worm's increased stats allow it to finish the remaining support units safely.