The Crystal of Unsealing (封印破りの水晶塊 Fūin Yaburi no Suishōkai ) is a key item found in Corpse Party.
The crystal of unsealing is found in the second wing of the third chapter while in control of Yuuya and Yuka behind the floor full of green bile. It is used to unlock the girls' lavatory in the second floor of the annex.
- The blessed shoes are required in order to acquire this item safely, because of the green slime blocks on the path that can injure/kill the player(s) if they are low on HP.
- In the Corpse Party BloodCovered manga, Kensuke Kurosaki finds it with Mitsuki's corpse instead of Yuka and Yuuya finding it on the floor.