Open only once. Roll 1d6.
1: one-use wand that kills anything. 2: potion + antidote, 2 drinks each; potion triples STR but costs 1 CON per combat turn until antidote. 3: empty; take 1 hit. 4: cursed 1000 gp ruby; monsters go berserk at double strength. 5: 200 gp necklace; on meeting a monster roll 2d6, 12 charms it. 6: rattlesnake; make SR, fail = 4 CON hits and STR halved until exit.