If 2 stacks of Grimheart are consumed upon unleashing the Holding Mode of Icetide Vortex, a Shattered Lightfall Sword will be created that will explode immediately, dealing 50% of the basic Physical DMG dealt by a Lightfall Sword created by Glacial Illumination.
Fun fact: she uses the same materials as Neuvillette, except for amethyst gemstones and talent book...