Glaedria is an Ultra Boss unlocked after defeating 1000 monsters in The Byfrost
Glaedria is like the Lava Dragon in Molten Crag, at least appearance-wise. It randomly fires horizontal beams of frost (Identical to those of a Wicked, except it does 100 damage.) Glaedria is really fast, but not so fast at turning.
Damage on contact: 100
Beam damage: 100
Health: Unknown (Took me 10 min with maxed Catastrophia set, Ironclad, and Sage's Staff to kill it, so it has quite a ton of health.)