Arcane Shell

This smooth, palm-sized stone shimmers faintly with a silvery-blue sheen, almost as if covered in a translucent film. Etched into its surface is a barely perceptible arcane rune that glows softly when held.

While attuned to this stone, you can use an action to cast the Mage Armor spell (1st-level, no spell slot required) once per long rest. The spell targets only you, even if you are capable of

When the spell is activated, a faint aura of runic symbols briefly swirls around your form, then fades into an invisible protective field.