Soul Mirror

Soul Mirror

Description: An enormous mirror in a hideous iron frame sculpted to resemble screaming faces. The mirror, which is thirty feet high and twenty feet wide

Very Rare Trap

HP 150

AC 15, cannot make saves

Immune: cold, fire, necrotic, poison, psychic, radiant, forced movement, all conditions, ongoing damage Identify (Arcana; trained only)

DC 18: The character realizes that the mirror can trap creatures in extradimensional cells but also realizes that the Arcana skill can be used to free such creatures. DC 22: Breaking the mirror frees the creatures trapped within. A prisoner might also be able to trick the mirror into releasing it.

Actions: Trap soul

Requirement: The mirror’s owner must activate this power and must be able to see the mirror to do so. Attack: Ranged 100 ft. (one creature that the mirror’s owner can see).

Hit: The target is trapped in an extradimensional space and removed from play. While trapped, the target has neither line of effect nor line of sight to any other creature, and other creatures have neither line of sight nor line of effect to the target. A trapped creature freed from the mirror appears in a space adjacent to the mirror or in the nearest unoccupied space.

Countermeasures

Escape: Insight DC 18 (standard action) or DC 28 (bonus action).

Success: The trapped creature escapes the mirror. The mirror’s owner takes 10 psychic damage each time a trapped creature escapes in this manner.

Failure (by 5 or more): The trapped creature takes 10 psychic damage.

Release: While adjacent to the mirror, (trained only) Arcana DC 18 (standard action) or DC 28 (bonus action).

Success: The character touches the mirror and commands it to release one trapped creature mentioned by name.

Failure (by 5 or more): The character takes 10 psychic damage. Shatter: If the mirror is reduced to 0 hit points, all those trapped within are released.

This mirror requires both attunement and a feat to get the full usage. It won't fit into the tower, so it is basically going to be have to be hung off the side. Attunement grants your INT bonus to attack rolls, and the home brewed feat allows you to add your proficiency bonus.