鈣質

When the attached card is played, a Bone-like additional attack effect triggers, dealing damage to all enemies. As a Rare gem, it adds a cleave-like element to any single card. It is particularly effective on floors with many enemies, since the damage hits everything simultaneously.

The exact unlock condition is unknown. It is believed to be unlocked by completing a specific run or fulfilling a certain in-game achievement.

Best used on finisher weapon cards as a final push to eliminate remaining enemies. Attaching it to frequently used cards allows consistent area damage accumulation throughout the run.

Tier B+ — Provides stable area damage value. Performs highly in multi-enemy environments but offers less benefit in single-boss encounters.