but if you put acid on an arrow, wouldnt it melt the arrow? or the sword? and besides, to do much damage to the "reciever", the PH must be Below Neutral Zone, or Above Neutral Zone. in other words, acid or alkali. but if it was strong,and can hurt the reciever, it can hurt the user, or his weapons. the acid vial idea is good, as acid cannot destroy glass (to my knowledge), and so are the poison weapons. perhaps a full health bar (FYI: consider having health under 100% having cuts, and the lower health is, the more chance of becoming poisoned yourself) to apply poisons to weapons. you have some nice ideas.