Boss fight
When ready, go to the Undercroft Stairway with the elemental diagram you used earlier for the statue order. There is an empty place at the center where you can place the charged orb.
You’ll get a brief bit of dialogue and need to pick up a key. After, go to the spawn area and interact with the giant statue in the fountain at the town center.
This begins the boss fight. He’s a giant statue with a hammer, and the fight plays out in three stages. This isn’t timed, so take your time and stay safe.
Stage one he has a slam/fire attack. Just stay moving around and avoid this.
This boss has so much shield and it just feels like you’re chipping away at armor plates forever unless you’re using the recommended Legendary rarity weapons or the drill. Eventually, you’ll do enough damage to make weak glowing spots appear on the boss. As your Gamer Brain may instinctively tell you, focus on these.
Unfortunately, the weak spots disappear for stage two. You just have to chip away and get new weak spots to appear. Lava/fire will start spreading around the arena, so you’ll need to be more careful about where you step.
Lastly, his chest is open/weak in the third stage. Just shoot his chest until he dies, and you will complete the Citadelle Des Morts main story quest.
