Ring of lost Memory

This ring stores up to 4 levels of spells.
Any creature can cast a spell into the ring by
touching the ring for 10 minutes.
You can cast stored spells. Spell save DC, attack
bonus, spellcasting ability of original caster,
otherwise treated as if you cast the spell.
1/LR Sentient entity can store spell < = 2nd level.
Spare the Dying, False Life, Identify, Detect Thoughts
Animate Dead, Summon Undead