Focus of Earth and Stone

very rare (requires attunement by a bard, 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: stone shape (1 charge), meld into stone (2 charges), move earth (4 charges), or wall of stone (4 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.