The storm-bird asked for this! It is but a small trinket, easily crafted. I have some experience working with the constructs of the Tyrant, and this device employs some of that same technology. It will orbit it's user, and absorb some of the harm they would otherwise sustain. As more damage accrues, it cracks. If it absorbs too much harm, it shatters and the core orbits alone, leaving the user vulnerable to harm. Left alone, the cracked shell will slowly regenerate. The exposed core can also grow an entirely new shell if needed.
As payment, I demand a microcosm of shifting weather.