Sentinel Batteries are an important collectible to find as they unlock different areas of the Fortress of Doom inDoom Eternal. Inside these unlocked areas are things like weapon mods, Sentinel Coins to upgrade your Praetor Suit, unique skins, and more.
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You’ll naturally acquire three Sentinel Batteries by completing certain missions on each level, but to get all of the unlocks you’ll need to find thehiddenSentinel Batteries. There are 18 in total and this guide will give you a general idea of where to find them.
18Cultist Base: Ledge
This one is at the first outside arena, where you fight two Revenants and a pack of zombies in between fiery pillars linked by chains. If you look up the mountain you can see the Battery. To access it, turn toward the cliff face and you’ll see a door with a ledge to the far side.
Jump on the ledge, break the door, then smash the button and you’ll unlock a Grav Lift. Go back to the pillars and walk off a beam on the cliff side where you can see a spot to drop down. At the end of this path is the elevator which leads to the Battery.
17Cultist Base: After Drawbridge
This one is easy to find. It’s located after walking up the drawbridge just before you reach the quest marker in front of the massive doors in the large hallway. After killing a Cacodemon simply hang a left and follow the path. It’ll be sitting on the floor.
16Cultist Base: Elevator Ride
While looking for the Super Shotgun you’ll ride an elevator to a floor with two Revenants and some zombies. After killing them you should see a grating that, when followed, will lead to another elevator. Take this one all the way down and exit into a room, if you follow the hallway you’ll find it on the floor.
15Doom Hunter Base: Under The Pillar
After surviving the first arena battle in this area go to the center of the map. Underneath the first pillar in that central ramp is a breakable floor gate. Underneath this is a small tunnel that takes you to the Battery.
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14Doom Hunter Base: Red Keycard
After grabbing the Red Keycard you’ll see a set of stairs on the right leading down. Just follow these stairs to grab an easy Sentinel Battery. Simple as it gets for this one.
13Doom Hunter Base: Floating Coffin
Later in the area you’ll see a coffin floating above a cliff. With some careful platforming, use it to get to the next area where you’ll encounter some zombies. Take them down and on the far wall you’ll see a Batteryhiddeninside a small alcove.
12Super Gore Nest: Wade In The Waste
Once you’ve acquired the yellow key and are in the process of looking for the red key you’ll find several radioactive pools on the ground with a tunnel guarded by spinning fire. Puzzle your way through this to reach a pillar spitting out fireballs. On the other side is a small sewer tunnel that leads to a Battery.
11Super Gore Nest: Lava Platforming
This one takes a few steps. It’s found in the Buff Totem area outside with several pools of lava. Follow the platforming path you need to to complete the objective Reactivating The Power 1/2. The Battery is inside a destroyed building covered in tentacles and flesh, just before your objective.
10Super Gore Nest: Slayer Key
To get this Battery you need the Blue Keycard. Go back to the first battle you had in this area and open the Grav Lift with the Keycard, the tornado is above it. Up the lift, follow the path up to the left (you’ll know you’re going the right way when you fight a Spectre). Inside a room with broken windows, you’ll find a Slayer Key and The Sentinel Battery.
9ARC Complex: Slayer Gate
Next to the Slayer Gate is a climbable wall next to a ledge leading to a dark doorway. you’re able to either dash jump to the ledge or use the climbable wall. In either case, once you’re on the other side you’ll find the Battery.
