|Nocte ex Mortis|
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"The number of property runes a weapon or armor can have is equal to the value of its potency rune. A +1 weapon can have one property rune, but it could hold another if the +1 weapon potency rune were upgraded to a +2 weapon potency rune. Since the striking and resilient runes are fundamental runes, they don’t count against this limit."
-CRB page 580