When equpping Felwinters Helm and a piece of the 2020 Solstice Ornament set, it seems to cause the glow on the armor to change to the Stasis Glow, instead of its associated elemental subclass. Note that this overide only seems to occur with Arc Subclass and Solar Subclass, Void is somehow exempt and acts completely normally. Taking off Felwinters helm causes the Solstice glow to revert to the characters equipped subclass and appropiate element