Ioun Stone of Reserve

(Requires Attunement)
You can store a spell of 1st to 3rd level into the
stone by touching it as the spell is cast. The level
of the slot used to cast the spell determines how
much space it uses. The spell uses the slot level,
spell save DC, spell attack bonus, and spellcasting ability of the original caster, but is otherwise
treated as if you cast the spell. The spell cast from
the stone is no longer stored in it freeing up space.