This ear stores spells cast into it, holding them forever as long as the attuned user is alive, once the user dies the items effects dissipate. The ear can store 1spell of any level at any one time. When found, it contains no spells and has the ability to act like a counter spell action to capture one spell.

Any creature can cast a spell of 1st through 9th level into the ear by touching the ear as the spell is cast. The spell has no effect, other than to be stored in the ear. If the ear can't hold the spell, the spell is expended without effect. 

While consumed you can cast any spell stored in the ear. the spell can be cast these many times per level of spell:

• spell level 1 = 2d10 times per long rest
• spell level 2 = 1d10 times per long rest
• spell level 3 = 2d8 times per long rest
• spell level 4 = 1d8 times per long rest
• spell level 5 = 2d6 times per long rest
• spell level 6 = 1d6 times per long rest
• spell level 7 = 2d4 times total
• spell level 8 = 1d4 times total
• spell level 9 = 1d4 times total

If a spell is expended its total times the ear will be digested and destroyed.

each time a spell is cast the caster must succeed on a constitution saving throw DC 10+ the spell level, if failed the caster takes (spell level)d10 force damage and the spell fails. on a succeeded save the caster takes half the damage and the spell succeeds. 

Notes: Once the item is used it needs to be consumed to attune to it so that it can be used., Buff, Utility, Consumable