Asylum would be interesting if the Bubble restored 50% of any party members health instantly once they entered the field. Each party member could choose when to heal themselves with it and it wouldn't constrain everyone's movement so much. The healing potency would be a lot less impactful compared to the original regen ticks but this could be countered by allowing the bubble to increase the healing potency of spell based magic like Fey Illumination does as long as the target is within the effect. Then it would be beneficial for the Tank or party for it's entire duration and could be used to bolster shields from a cohealer as well. You could top up the party by dropping it before a stack mechanic and then heal more effectively through the blast. It just has so much potential to be more impactful than jailing the party in a high movement fight.