I can't think of a new reasonable trial tbh.
I would however change Sophias trial. It annoys me that her trial is so easy.
Phase 1 should be shorter, alot shorter. Like just up to 85%. Why? So we spend more time in actual danger. Add phase can stay as is but if someone gets actually confuse, that players attacks will automatically trigger confuse on the other players.
For quasars, the blue meteor shouldn't give away which site is safe. Also add something that weights "2".
Make players that fall off not raiseable. Make 2 Quasars appear in short succession.
Have Barbello teleport more frequently arround the stage and attack the party with dodgeable AoEs while clearing other mechanics such as sin and punishment. Have quasars (That move the stage) appear during Clones. Have gnopsis appear right before placing meteors in clone phase.
Have all her adds reappear during the last phase, all at once and cloudy heavens debuff too.
Well I guess thats it?

... :^)