You can use items to hurt (Dead Pepper, Dark Matter) and heal (the jewels). And Thievery, Dragon's Crest and Limit Glove cause fixed damage.Originally Posted by KuRt
Thievery is (Numner of Successful Steals) x 12
Dragon's Crest is (Nunmber of Grand Dragons you killed) x (Number of Grand Dragons you killed). Or something like that. I don't know if only Grand Dragons affect Dragon's Crest and other dragons do, as well.
Limit Glove is simple. Causes 9999 damage when Quina has 1 HP.