Crown of Iron Sorcery

Wondrous item, very rare (requires attunement)

This battered circlet resembles a twisted serpent with two heads, clutching a blackened crystal between their jaws.

You can cast spells in armor that you are not proficient in, and if you are wearing magical metal armor or wielding a magic metal shield, you gain resistance to all non-magical bludgeoning, piercing, and slashing damage. You can store up to three spell levels of spells in the crown of iron sorcery, as if it were a ring of spell storing and also implant a spell of up to 3rd-level in a weapon that you touch, as if it were also a ring of spell storing. This weapon can only be used as a ring of spell storing by you so long as you are wearing the crown.

Epic Attunement. You are automatically proficient in any armor you put on so long as you are wearing the crown of iron sorcery. Furthermore, any iron or steel object you carry is immune to rusting and rusting attacks such as the rust monster’s Antennae attack.