Dance of Decay is a Weapon Art in Derelict. Dance of Decay (short description), (short effect/damage description)
"Spin with venomous grace, slashing 3 times around you, dealing 30% Power damage each. Slash up to 6 more times every 100% extra Attack Speed. When you are affected by Venom, your slashes double."
Acquisition
Dance of Decay can be obtained automatically from crafting a Serpent's Dagger.