This lands in your setting

Preloaded with all the known sapient species in your setting

How does it go?

The world's greatest prostitute is born.

That's hot as fuck.

It can change you into a human!
There's a pretty good chance that the human it changes you into looks and sounds nothing like the human you are by default, so I guess that could be helpful for disguises.

Would STDs persist through transformations?

OH BOY, HERE COME DRAGONS

Dragon-Emperor sends his scions to recover it, they do, he adds it to his hoard.

Done.

A bracelet that grants shape change?
We already have dozens of those.

>wh40k
Well it's probably considered heresy of some sort, no doubt being used by an or do xenos inquisitor

Yes, the character who wore it caught a cold once and it persisted through all his transformations, with weird effects.