@IGKU
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First, roll just one time. 3 or less is creatures (roll creatures for each character). If 4 or more, roll only 1 event (so only 1 treasure) for all characters or, if is trap, all characters take damage.
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When I play with more than one character, I let everyone use the items however they want. Respecting the rule that spells (or scrolls) is only in combat.