- Cost to restore: 2,500 crystals
- Location: Shell
- Effect: The user takes damage over time in battle. The damage taken is reduced the longer the battle takes, eventually diminishing to 0.
This sealstone can be helpful when set in a dais, especially on battlefields that require you to move around to reach some enemies, as it will damage them while you do so. This is notably the case in this dungeon. The sealstone loses its usefulness as the game progresses, but you may consider using it for Boss battles. It is, however, relatively costly to restore. You can find a more advanced version of it in the Seraphic Gate.