(This flat item looks and smells vaguely like Ginseng.)

(Ritual incense--that's what this must be!)

(Burn it on the Stone Altar Censer.)

• "I should take this and use it."

You picked up some incense. Light it in the burner on the stone altar.

When you lit the incense in the burner on the stone altar, a huge, millennium-old ginseng plant appeared.