Cronvangr Cave is a cave located due east and across the river from Mixwater Mill. Inside are a number of Frostbite Spiders and a hidden vampire lair. It is also one of the possible locations of Queen Freydis's Sword. There is also an Iron Ore Vein inside.
In the first large chamber, there is a button on the wall which activates a secret door. Behind the secret door, in the hallway leading to the vampire lair, there is a pressure sensitive fire trap. Inside the vampire lair, there is a cabin, an alchemy lab, an arcane enchanter, and also several vampires.
- To the west of the cave entrance: Corundum Ore Vein; to the north-north-east: Silver Ore Vein.
- In secret lair: a copy of The Locked Room, Black Soul Gem, bed ×3, Sapphire on barrel, chests ~140, ~470 value (L42).
- At bottom of pool of water: Chest ~220 value (L42).