Marble Cloud / Entropy Cloud is a colossal entity of entropic destruction that appeared over the battlefield of Kosovo Polje in 1389 in Uchronic Paris. It carried the Predators and threatened to crush the Serbian army.
Aby Warburgo destroyed it with a positive-energy healing spell channeled as a touch attack, the entire discharge of a healing poured out as a weapon. Its entropic nature made it vulnerable to positive energy, an inversion of the principle of healing.
Swan sang throughout the battle, wounding the Cloud’s regeneration with the performance. Swan’s song together with Aby’s healing destroyed it.