Focus of the Gaol
very rare (requires attunement by a cleric, druid, sorcerer, or wizard)
This focus has 10 charges. While holding it, you can use an action to expend 1 or more of its charges to cast one of the following spells from it, using your spell save DC and spellcasting ability modifier: hold person (1 charge, cast at level 2), hold monster (2 charges, cast at level 5), maze (5 charges), or imprisonment (10 charges).
The focus regains 1d6 + 4 expended charges daily at dawn. If you expend the last charge, roll a d20. On a 1, the focus blackens, crumbles into cinders, and is destroyed.