@SnowCheetah2468 guessed correctly! The last herb was Sorrel! Here's the next riddle:

I grow through leaf-bare,
I'm a thick green stem with long buds at the top.
You need to swallow my sap,
I ease infection.

:3
~Night

Read my new book: The Worst Warriors Fanfic Ever ! You promised me on the River of Styx. A bad curse will be placed on you/ you will have bad luck. I'm not suspicious, but still, you should probably just go and read that book.

Why are you still here?

Oh. Right. To answer the riddle. Carry on.

But you read after you answer.