Magüi are sacred creatures, and a living creature that attacks a magüi must make a DC 16 Constitution saving throw at the end of its turn or contract a disease, as the contagion spell (determine type of disease randomly). A creature that kills a magüi on its turn has disadvantage on this saving throw and also takes 8d6 necrotic damage, or half as much on a successful save. This curse has no effect on creatures with Intelligence of 3 or less, and creatures that cannot see the magüi have advantage on their saving throw.