CloudOfEarlyAutumn guessed correctly! The last answer was nightshade! My old OC name. Here's the next riddle:

I taste like frost on grass; the same, fresh or dried,
My leaves have a crinkly feel, and I helped a she-car break two codes.
The apprentice found me, with the help of two elders and a senior medicine cat,
And I stop milk in nursing queens.

:)
~Night