Armband of Healing

This item bears the insignia of a caduceus--two snakes entwined about a staff.

When you cast a spell that restores a variable number of hit points while wearing this armband, you can trigger the armband without using an action. The initial spell restores the maximum possible hit points.

It can be used once per day.

Adapted from The Book of Marvelous Magic.

Image generated with Stable Diffusion.

Notes: by a spellcaster, Healing, Buff