This is the code for removing Icy Veins:
playercharacter.js, line: 2542:
if (this.hasPerk("Icy Veins") && this.perkv1("Icy Veins") > 0 && (!this.hasSkinFlag(GLOBAL.FLAG_FLUFFY) || ([GLOBAL.SKIN_TYPE_FUR, GLOBAL.SKIN_TYPE_FEATHERS].includes(this.skinType) === false)))
{ // removal of Icy Veins...