Marketable Plushy

Lusabeth pulls out a tooth and you slowly see the tooth transform into a marketable figure

Lusabeths Charm! you should be honored mortal! 

it radiates an unknown energy, it squeeks when you squish it, roughly the size of a keychain, so a welcome add on to any key/lanyard

Lore:

acts sort of training wheels for Jessi, the charm will suck up any excess mana Jessi has past a certain point and will store it for later, having too much mana can cause some bad side effects for a human if they are not used to it

the charm will noticeabley grow in size based on how much mana it has consumed. but squeezing it can release the stored mana when Jessi eventually figures it out