>>527499450
Remember that Kris looks like they have horns here because they are wearing a horn headband, so this picture doesn't confirm Dess is a deer. She could just be wearing an antler headband. Remember that Sans implies Dess doesn't have antlers. Remember that the Roaring Knight is wearing a helmet Kris knows they can take off, meaning the antlers aren't actually part of their anatomy. Dess was a human and the Knight is a darkner of their corpse which can use its remnant of human determination to open fountains.