Aethusa's Prison

Trigger The prison takes any damage

Effect The prison uses its Chromatic Eruption action as part of this reaction, then gains immunity to the triggering damage type until the hazard resets. The hazard then rolls initiative.

The prison regains 30 healing Hit Points. Then, if the prison is at maximum Hit Points, the hazard deactivates and immediately resets.

Requirements The prison has less than its maximum Hit Points

Effect Tendrils of uncontained magical energy lash at creatures in a 20-foot emanation, dealing 10d6 untyped damage (DC 37 reflex save) of a randomly determined type. Roll 1d4: 1–acid, 2–cold, 3–electricity, 4–fire.

Trigger The prison takes acid, cold, electricity, or fire damage

Effect The prison takes the damage but then gains immunity to the triggering damage type until the hazard resets.