Eyeless One has 1,400 health and spawns in the Deep North.
It resists frost; spirit does nothing to it at all. Blunt, slash and pierce land at full damage, so that is what to bring.
Its hardest hit is claw at 100 poison, 80 blunt and 40 slash, out of 3 attacks.
Some of what it throws is elemental, so poison resistance is worth having.
Of everything craftable, 
Thunderblood Crossbow, 
Lightning Strike and 
Frostfire Crossbow put the most damage through what it resists.
It always drops 
Long Claws.
Eyeless One is the heaviest thing in the Winding Tunnels, one placed per dungeon across its 17 rooms. It has 1,400 health, resists frost and is immune to spirit, but unlike the 
Elaking it shares the tunnels with, it takes no extra damage from fire. It runs at 2, slow enough to walk away from, and hits with a 60 blunt sand cloud at range and two claw swipes that each land 80 blunt, 40 slash and 100 poison. It always drops 1 to 2 Long Claws, with a 
Mould: Intricate Key at 50% and the 
Eyeless One Trophy at 10%.
Resistant to frost and nothing else, so every weapon you own works. The real threat is poison: both claw swipes carry 100 poison on top of 80 blunt and 40 slash, so a poison resistance mead is worth more here than another armour tier. At run speed 2 you can simply walk out of range whenever the health bar looks wrong. It always drops 1 to 2 Long Claws, the material behind the 
Nord Knucklechains and the 
Neckstabber, and half the time a Mould: Intricate Key.
With devcommands enabled, this spawns Eyeless One in front of you. The third number is the level: 3 spawns a 2-star.
Creature ID: ElakingMole · all console commands and IDs