Potency Crystal
Item 1ConsumableEvocationMagicalTalismanSource Core Rulebook pg. 569 2.0Price 4 gp
Usage affixed to a weapon
Activate 
envision;
Trigger You make an attack with the affixed weapon, but you haven't rolled yet
This fluorite crystal glows with a strange phosphorescence. When you activate the crystal, the weapon becomes a
+1 striking weapon for the rest of the turn, gaining a +1 item bonus to the attack roll and increasing the damage on a hit to two weapon damage dice.