How to Find Gael Tunnel
Gael Tunnel is located on the border between Limgrave and Caelid, with the rear entrance opening in the former and the main entrance in the latter. Since the rear entrance doesn’t allow you to fully explore the location (a door which can only be opened from the other side blocks progression), it’s considered a Caelid location.
To reach it, you can use the Spiritsprings north of the Third Church of Marika to ascend the cliffs, then follow the road northeast (be wary of the Smoldering Church, as Anastasia Tarnished Eater lurks nearby) to reach a wall separating Limgrave and Caelid. At this wall turn south and jump on some rocks and ride south, drop down a ledge to find a graveyard, drop down another two ledges and turn east to find another entrance to the Gael Tunnel.
Best Loot in the Gael Tunnel
|Cross-Naginata||Loot a corpse in the room with the Giant Land Octopus.|
|Dragon Heart||Defeat the Magma Wyrm.|
|Moonveil||Defeat the Magma Wyrm.|
Enemies in the Gael Tunnel
|Giant Land Octopus||Land Octopus Ovary, Octopus Head, Strip of White Flesh||-|
|Land Octopus||Land Octopus Ovary, Octopus Head, Strip of White Flesh||-|
|Magma Wyrm BOSS||Dragon Heart, Moonveil||Optional boss.|
|Miner||Explosive Stone Clump, Smithing Stone (4)||-|
|Radahn Soldier||Bolt x5, Brass Shield, Radahn Soldier Gauntlets, Radahn Soldier Greaves, Radahn Soldier Helm, Lordsworn’s Bolt x5, Lordsworn’s Straightsword, Mushroom, Smithing Stone (2), Smoldering Buetterfly, Redmane Surcoat, Warpick||Drops Vary by Enemy Armament|
How to Complete the Gael Tunnel
Assuming you enter these mines from the Caelid side, you’ll travel down a linear passage until you reach a ledge overlooking a pit. Kill two Radahn Soldiers on this ledge, then drop down to various lower ledges, working your way clockwise until it’s safe to drop down to the bottom. As you descend, search a dead end passage to the north to find a Somber Smithing Stone (2). At the bottom of the pit you’ll find the Gael Tunnel Site of Grace.
Venture north and you’ll find a large chamber occupied by a multilevel wooden platform. Most of the dungeon’s enemies lurk in this chamber, including around a half dozen Radahn Soldiers and a similar number of Miners. Aside from one patrolling Miner and two resting Miners, most of the miners won’t be hostile unless you attack them or one of the Radahn Soldiers rouses them by blowing his horn (this Radahn Soldier can be found on the ground floor, resting behind a wooden pillar). You can dispatch a great many foes with backstabs, and as usual ranged magic will work wonders on the Miners, who are otherwise resistant to physical damage.
Killing most of the foes here isn’t really necessary, as they don’t guard any particularly noteworthy loot, and most of the ones under the platform won’t attack unless you go out of your way to provoke them.
There are two forks branching off this chamber, a Land Octopus-filled chamber to the northeast (a pair of Radahn Soldiers keep watch on the terrestrial cephalopods) and a passage to the northwest. If you can kill the Land Octopus enemies - including a Giant Land Octopus - you can claim the Cross-Naginata weapon off a corpse in the southeastern corner of the chamber.
From the central large chamber, head northwest to reach a ledge, where a Radahn Soldier overlooks a ladder. Backstab him, climb down the ladder, then defeat a horn-wielding Radahn Soldier and a Miner, the latter of which will remain fixated on his mining unless the former manages to sound his horn.
Go down a tunnel to the south and eventually you’ll reach a chamber with a door to the west and some double doors to the north. Ignore the doors to the north, as they lead to the area’s boss, but do be sure to open the door to the Rear Gael Tunnel Entrance Site of Grace, which will make returning to the boss chamber much more convenient. Note that you can find Alexander just beyond the door leading to the Rear Gael Tunnel Entrance Site of Grace, but he has nothing terribly interesting to say here.
Once you’re rested up, all you need to do is head back to confront the boss of this dungeon, the Magma Wyrm. While the Magma Wyrm isn’t one of the game’s more challenging bosses, it is intended to be a lower-midtier foe. If you’re engaging with a fresh character, there are a number of attacks that may one-shot you, so if you’re struggling, there’s no shame in boosting your Vigor and returning when you’re more sturdy. Stay mobile when fighting this boss, as standing in the magma it emits isn’t a very good survival strategy, especially during its charge attack. While generally lethargic, its area denial attacks can make it somewhat tricky, and summons are likely just going to get burnt to a crisp by its magma. You also need to be wary of the beast’s sickle-sword - some of its initial strikes aren’t the main threat, as the Magma Wyrm will pull the blade back towards itself after striking, which may catch the unwary off guard.