Armor (shield), rare (requires attunement by a any class that can use shields)
This is a +1 shield that allows the wielder to cast Absorb Elements at will as a reaction. It functions as the spell normally does, but it can also absorb radiant, necrotic, force, and poison damage. This item does not function if the offending damage is paired with bludgeoning, slashing, or piercing damage.
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.
Notes: Bonus: Armor Class, any class that can use shields
Really cool combination, but had to down vote because in it's current state it's way too overpowered.
In essence you are giving a player an item that (as long as they're attuned to it) gives them resistance to nearly every damage type, buffs the players damage output in return, and gives them a +3 to AC.
Consider limiting the Absorb Elements ability to at most 3/day and if you want to keep the additional damage types it can absorb then you should raise it's rarity to at least very rare. Check out Spellguard Shield and Animated Shield to compare power level to other very rare shields.
Overall the idea is solid, but just needs some nerfing.
It's the zucc, stealing your damage.
(requires attunement by a any class that can use shields) just have it say that you have to be proficient, because theres more than one way to gain proficiency with shields, feats are one, downtime training is another