D&D 5th: Demon Tower of Madness
Minor Ring of Spell Storing
Property [Attuned]: A minor ring of spell storing contains up to three levels of spells that the wearer can cast. Each spell has a caster level equal to the minimum level needed to cast that spell. The user need not provide any material components or focus, or pay an XP cost to cast the spell, and there is no arcane spell failure chance for wearing armor (because the ring wearer need not gesture). The activation time for the ring is same as the casting time for the relevant spell, with a minimum of 1 standard action.
A spellcaster can cast any spells into the ring, so long as the total spell levels do not add up to more than three. A spellcaster can use a scroll to put a spell into the minor ring of spell storing.
The ring magically imparts to the wearer the names of all spells currently stored within it.