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In Borderlands 4, you need to defeat three main enemies before facing the evil Timekeeper. The first one to target is Idolator Sol. During the main quest “Rush The Gate,” you’ll take him down. But first, you must join the Outbounders to attack Sol’s base, Fortress Indomita.
This mission kicks off right after finishing “One Fell Swoop.” It will take around two hours, depending on difficulty—shorter on easy, longer on hard. Prepare for a tough fight against one of Kairos’ biggest foes.
Find The Missiles
Return to the Launchpad to locate Rush in the underground base called Fadefields. The entrance is under the bridge. Once inside the room with the war table, a cutscene starts where Rush and Zadra discuss plans to attack Sol. Soon after, an assault begins nearby, and Rush instructs you to use missiles from a crashed ship against Sol.
Approaching the ship to the south of the Launchpad, you’ll be attacked by Rippers. Defeat them and talk to Rhodes near the crashed ship. He’ll send you to get missiles from a larger wreck above. Climb onto a smaller ship, then use your grappling hook to pull the missile down.
Now, it’s time to meet up with Rush. He’s located east of Horizon’s Mar and northeast of Tetanus Quad.
Escort The Tank
Find the tank Rush is in and guide it into the bunker. The tank will stop at a blocked wall. Rush will ask you to grab some canisters from the back of the tank and throw them at the obstacle using your grappling hook. One hit is enough to break the wall. After clearing the way, fight off the enemies that appear.
Once the area is clear, Outbounders gather around the tank. Rush tells Conway to take everyone and leave. Activate the nearby elevator to rise to the top. When you reach the arena, defeat the remaining enemies. Rush will blow up the tank, destroying the wall, and you can then enter Fortress Indomita.
Inside Fortress Indomita
Inside, take a moment to reload if needed. Proceed to the next room and eliminate all enemies. You’ll see the airship first, then move toward the refueling platform on the left. Press the glowing green button to activate it.
Climb the platform and look for a grapple point. Use it to pull yourself upward and then to another grapple spot. From there, identify two docking clamps and remove them. Then, glide to the distant platform, which is swarming with enemies. Clear them out carefully, as it’s easy to get overwhelmed. After defeating the enemies, find the last clamp.
Next, another grapple point will lead you to a crane. Use it to glide onto the top of the airship. Drop into the room with the computer and checkpoint.
Getting to the Final Encounter
From the airship, head through the sliding doors and press the green button to lift the platform into the arena, where enemies await. Clear the area, then move through the next group of foes to reach the room with vending machines and a checkpoint. Prepare to face Idolator Sol.
How To Defeat Idolator Sol
Idolator Sol isn’t very hard at first, but he can turn most of the battlefield into a toxic black hole, which can quickly drain your health if you’re not careful. When the fight starts, you might notice he’s fully armored and immune to damage. To temporarily remove his armor, focus on his red spike barrage. When you see the single green spike, grapple it and throw it at Sol. This melts his armor and exposes green pustules, which are critical spots you can shoot for extra damage.
During the fight, watch for him lifting his metal arm—dodge to the side. When he does, a dark energy beam shoots out, and if it hits a grunt, the grunt will transfer energy to Sol, helping him restore armor. Kill the grunt quickly. Also, when Sol charges or throws projectiles, dodge to avoid spikes or damage.
The toughest part arrives when Sol covers the battlefield in a toxic black hole. Stay near the edges so you can dash to the safe zones when he moves the effect area. When he surrounds the arena with black energy, stay close to the middle, avoid fissures, and keep attacking his weak spots. Continue bouncing his green spears back at him and shooting him until he’s defeated.
After defeating Sol, collect his Bolt and any loot. Then, return to the Launchpad and talk to Rush to finish the mission.
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