Avarice

When Avarice dies, her corpse freezes for 9 days, during which time it can't be thawed, harmed by fire, animated, or raised from the dead.

Avarice wields a staff of frost with 10 charges (see "Actions" below).

Ranged Spell Attack +6 to hit, range 120 ft., one target. 11 (2d10) Fire damage.

While holding this staff, Avarice can expend 1 or more of its charges to cast one of the following spells from it (spell save DC 14): Cone Of Cold (5 charges), Fog Cloud (1 charge), Ice Storm (4 charges), or Wall Of Ice (4 charges). The staff regains 1d6 + 4 charges daily at dawn. If its last charge is expended, roll a d20; on a 1, the staff turns to water and is destroyed.

When Avarice is damaged by a creature that she can see within 60 feet of her, she can banish that creature to a frigid extradimensional prison for 1 minute. While there, the creature is Incapacitated and takes 5 (1d10) Cold damage at the start of each of its turns. At the end of each of its turns, the creature can make a DC 14 Charisma saving throw, escaping the prison on a success and reappearing in the space it left or in the nearest unoccupied space if that space is occupied. A creature that dies in the prison is trapped there indefinitely.