Bag of Nasty Magic Beans

This heavy cloth bag contains 3d4 dry beans when found. The bag weighs half a pound regardless of how many beans it contains and becomes a nonmagical item when it no longer contains any beans.

You must eat a bean to earn its effect. 

Upon eating a bean, you may cast detect magic or detect traps at will. 

However, you will need to succeed a CON Save (DC 15) or take 1d6 poison damage. The beans taste terrible. If you fail the save, you vomit the bean back up and the spell is lost.