Board Thread:Questions and Answers/@comment-2607:FEA8:64DF:D6A8:85D0:63A3:BE82:AFF2-20200117082208/@comment-36170150-20200117102824

Basically there are 5 phases, Normal phase, Sarai's phase, Riala's phase, Wendys' phase, and Qum's phase. Talking with each character will take you to a different phase where certain things about the dungeon will be slightly different, you can only be at 1 phase at a time.

If you have already undone all the blockages, to reach the Crystal of Stability you need to return to the "Normal phase", all other phases will have a final impenetrable wall blocking the chest, to revert to the "Normal phase" simply talk with the character of your current phase, they will give you the option to return to the "Normal phase".