Enrage, staggering and dealing 150% heartrune damage to targets within 3m while turning into a hulking beast. For 10s, light attacks deal 100% damage and your heavy attack is a leap, dealing 120% damage and knocking down targets. Trigger again to end it, dealing 150% damage within 3m.
Heartrunes under GS700 can be upgraded at a Stonecutting station.