Arena of Trust

As part of casting the spell, choose up to 6 willing creatures within range. For the duration of the spell, all creatures cannot be killed by each other while inside the arena. Instead, when the creature takes fatal damage from another affected creature it is reduced to 1 hit point and the spell ends on them. The spell also ends on a creature, when there is no other creature affected by this spell. This spell also ends on you, when you engage in combat with the creature, that is not affected by this spell.

When there is no creature affected by this spell, all creatures regain their hit points lost by creatures that were under this spell.