[ Magical medical devices.....well, that's one way of putting it, he supposes. Sighing, Eustace rocks back on his heels, ears tipping up into an alert position. ]

Sort of. It's what keeps you alive here. So long as that piece of crystal is affixed to your body and undamaged, you should be able to recover from most major injuries.

[ ..............

A stray thought comes to him, unprompted and unnerving. Actually, wasn't there something weird about Moondweller digestion? Just in case, he adds a follow-up, the words sharp and quick like a parent ready to scold their child. ]

Don't eat it.