Mageplate Cap (Patreon)

Wondrous item, rare (requires attunement by a wizard or sorcerer)

This pointed hat is fitted with chain and metal that have been enchanted with empowering abjuration magic. The cap has 4 charges and regains 1d4 expended charges each day at dawn. While wearing the cap, you can expend a charge to cast the shield spell. In addition, whenever you are the target of the mage armor spell, your base AC becomes 14 + your Dexterity modifier instead of the spell's normal change to your AC.

The magic protections were too much for the beast to break through. The vile monster may have felled his allies, but it wouldn't topple his defensive arcane weavings so easily.