Bravil Wizard's Grotto
The Giant Slaughterfish found inside the Grotto
Map
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Enemies	Conjurers Dremora Slaughterfish Giant Slaughterfish

Bravil Wizards Grotto is basically a large labyrinth and the secret experiments performed by castle wizard Fathis Aren and his conjurer allies make the area both uncomfortable and very dangerous. A healthy amount of lockpicks as well as water breathing abilities are essential for a successful exploration. Unless you managed to locate the secret entrance in the middle of the Niben Bay you will arrive from Castle Bravil through door and will immediately be faced with the unusual sight of a Dremora guarding the first intersection. Ignore the gate to your left as it only leads to a barebones underground maze and pick the lock on the gate at. Both tunnels ahead leads to the same chamber, with knee-deep water and several paths to choose from; if you are just here to complete the quest, take the southern or western path and skip the next section. Otherwise, locate the old wooden door and pick the lock.

The door reveals an entire subsection inhabited by conjurers and lots of options. The dead end to the north contains several piles of bones and a common soul gem. A conjurer will most likely detect and attack you, so be prepared. Proceed south and note that the wooden door says ‘key required’, although no key exists. The northern chamber contains a minor loot chest and a poisoned apple, while the chamber opposite the locked door gives access to the rest of the conjurer lair, a large room filled to the brink with treasure, potions and rare ingredients, along with alchemic equipment and two bedrolls. Pick up what you need and backtrack all the way to watery room south of the wooden door then head east until the knee-deep water turns into a very deep, flooded pit.

Check your water breathing abilities and prepare for a long dive. The pit is inhabited by a few slaughterfish and is incredibly deep. On your way down, look at your map and note the underwater path leading north; this is the path circumventing the locked door and the only way to proceed in the dungeon. Ignore it for now, and dive even deeper into the pit until you see a hole at the bottom; this is the lair of the unique Giant Slaughterfish, so prepare yourself for an underwater boss battle. Make sure to loot the dead fish for a huge amount of valuables then swim west towards a tunnel where you will find door Out, the secret entrance from Niben Bay. Backtrack to the tunnel leading north and swim until you finally surface near an alcove with some lower level equipment. At the next intersection, ignore the left path as it leads to the other side of door and head right. As you approach the last intersection you will most likely be detected by the boss-leveled Dremora, so dispose of him and consider picking the lock of the nearby door, even if it will only net you another fight against a leveled Daedra, a restoration chest and some alchemic equipment. Finally, pick the Nirnroot and make your way to the locked door, the entrance to Bravil Wizard's Lair.