Glacius makes a clicking sound of consideration, trying to figure out how to best explain this without giving too much away. "It depends... my kind has invented technology that allows us to hold our form in warmer temperatures, but if the heat becomes too extreme it can cause a number of complications." If Rey looks close enough at him, she can probably discern what that technology looks like; everything about the being in front of her is natural, save for a pattern of glowing glyphs that light up periodically, making it look like they're flowing over his body.