The shield is made from misteryous material but it's obvious that it is touched by magic. The shield is round and small. With a colorless gem in the middle.

The shield has 3 charges. If you are hit with a spell, you can expend 1 charge to store the spell's power in the shield for 1 minute, after that the spell vanishes. While a spell is stored in the shield, you can use the spell as a bonus action, spell's damage is doubled if you stored the spell last turn. The shield recover all of it's charges next dawn. +1 to your AC

You can take an Attack action with this shield dealing half the damage of the last stored spell in the shield, or all the damage if the spell is still stored inside.

The shield is cursed, while wealding the shield you can't wield any other Shields or Weapons, and the shield can't be taken off* until it is out of charges.

*The shield connects itself to it wielders arm, and becomes one with it.

Shields require the Utilize action to Don or Doff. You gain the Armor Class benefit of a Shield only if you have training with it.