Key Gimmick: Splits into 3 smaller worms at 50% HP.
Strategy:
Phase 1: Stay in Mid Stance. Block its poison spit. Dodge to the side when it charges.
Phase 2 (The Split): Immediately pop Yokai Shift (Brute) or use a large AoE Soul Core (like Mezuki) to hit all 3 parts at once. If you don't kill the clones fast, they will heal the main body.
Cheese Strat: Use Lightning Talismans on your weapon. The "Electrified" status makes its fast wiggle animation play in slow motion, giving you huge parry windows.