Borderlands 4 features a wide range of challenging bosses, both in side quests and the main story. These bosses drop valuable loot, making them worth defeating repeatedly. This guide details the primary bosses of Kairos, including the Timekeeper and his commanders, and lists the weapons and gear they can reward you with.
Okay, so heads up – I’m about to talk about the final bosses of Borderlands 4, which means *major spoilers* ahead! Seriously, if you haven’t finished the story yet, come back later once you’ve had a chance to beat them and grab some loot. I’m going to be detailing the gear they drop, so you’ve been warned!
Idolator Sol
What Legendary Loot Does Idolator Sol Drop?
- Mission Required: Rush the Gate
- Boss Location: Fortress IIndomita, The Fadefields
| Legendary | Type | Description |
|---|---|---|
| Golden God | Shotgun | Rage – When Overheating, the Bulletforge does not break, but instead continually consumes greater amounts of Ammo. |
| Goremaster | Shotgun | Chief Execution Officer – Deals Damage to enemies below Health. |
| Kickballer | Shotgun | Force Bunt |
| Onslaught | SMG | Keep It Coming – There’s a 30% Chance for every bullet fired to deal extra Damage and not consume Ammo. |
| Bio-Robot | Harlowe Class Mod | Whenever Harlowe Entangles an enemy, she creates alternating Cryo Hazards and Radiation Hazards. |
| Dancer | Rafa Class Mod | Overdrive bonuses are increased. Overdrive ends whenever Rafa’s Action Skill ends. |
| Furnace | Amon Class Mod | Damage from Fellfrost, Hoarcleave, Fulminating Fist, and Stormcutter is converted to Incendiary Damage. |
| Technomaster | Vex Class Mod |
Idolator Sol is the first big boss players encounter, and he’s known for dropping a lot of valuable loot – which makes sense, given his extreme greed! You can find him at the end of Fortress Indomita in the southeastern Fadefields. He’s actually a pretty easy fight, and surprisingly weak to fire – only needing three Flesh bars destroyed. To hurt him, you’ll need to wait for him to shoot out canisters, grab the green ones, and throw them back at him to break his armor. Don’t forget to shoot the green bulbs on his body for even more damage, then collect the awesome rewards from his defeat!
Vile Lictor
What Legendary Loot Does Vile Lictor Callis Drop?
- Mission Required: His Vile Sanctum
- Boss Location: Umbral Factory, Terminus Range
| Legendary | Type | Description |
|---|---|---|
| Super Soldier | Shield | Power Play – When Energy Shield fills, grants an Overshield. When Energy Shield is full, grants Fire Rate, Movement Speed, and regens Ammo/s. |
| Ruby’s Grasp | Pistol | Grasp – Reloading the Gun fires Homing copies |
| Blockbuster | ||
| Blacksmith | Amon Class Mod | Kill Skill. Partially restores all active Forgedrone’s Duration. For each active Forgedrone, Amon deals increased Gun Damage. |
| Undead Eye | Vex Class Mod | Killing an enemy with a Sniper Rifle will trigger Blood Shot. Critically Hitting an enemy with a Sniper Rifle has a chance to trigger Blood Shot. |
| Instigator | Rafa Class Mod | Whenever Peacebreaker Cannons fire at an enemy, gain a Stack of Instigator and lose all Stacks when Peacebreaker Cannons fire at a new enemy. Rafa gains Gun Damage for every Stack of Instigator. |
| Generator | Harlowe Class Mod | Whenever Harlowe activates her Flux Generator, she decreases her remaining Action Skill Duration and gains Action Skill Power. |
If you’re up for the challenge, you can find Vile Lictor in the Umbral Factory, located deep within the Windspear region of Terminus Range. He’s a good boss to farm because he has a chance to drop a Legendary Class Mod for every character. Vile Lictor boasts a large variety of potential loot, and he’s not overly difficult to defeat. He starts with an Armor bar, so switch to Corrosive or Cryo weapons when he emerges from his machine. Once his Armor is down, he’ll teleport to a new phase where his Shield can be broken with Shock damage. Throughout both phases, he attacks with beams from his multiple hands, so be sure to shoot them down.
Callis, the Ripper Queen
What Legendary Loot Does Callis the Ripper Queen Drop?
- Mission Required: Her Flaming Vision
- Boss Location: Moon-Called Throne, Carcadia Burn
| Legendary | Type | Description |
|---|---|---|
| Queen’s Rest | Pistol | Royal Armoury – Fires high-speed rounds. Damaging enemies has a chance to spawn a Homing Sticky Projectile. |
| Illusionist | Vex Class Mod | Specters and Reapers have a chance to be Badasses, gaining increased Maximum Health and Damage Dealt. This chance increases the longer it hasn’t occurred and will at least occur once every 90 seconds. |
| Viking | Amon Class Mod | |
| Esgrimidor | Rafa Class Mod | |
| Skeptic | Harlowe Class Mod | |
| Pandoran Memento | Shield | Psychosis – When Damaged, grants Elemental Resistance and Resistance to the last Damage Type received. |
You’ll find Callis in the Moon-Called Throne, part of the Fallen Crown area in Carcadia Burn. You can only get there after finishing the quest ‘Her Flaming Vision’. Defeating Callis gives you a chance to earn the Legendary Pistol, Queen’s Rest, and a Legendary Class Mod specific to each of the four Vault Hunters. To beat her, use weapons that deal Corrosive or Cryo damage to break her shield, then switch to Incendiary weapons to damage her directly. Callis tries to crush you with her metallic arms and create fiery explosions, but she’s vulnerable and can be defeated before she starts attacking with long-range spider webs.
Moon-Maddened Callis
What Legendary Loot Does Moon-Maddened Callis Drop?
- Mission Required: Another Day, Another Universe
- Boss Location: Elpis Orbital Shatterfield, Carcadia Burn
| Legendary | Type | Description |
|---|---|---|
| Gamma Void | Heavy Weapon Ordnance | Radiant Exposure – Creates a Singularity for 10s, in which enemies take 40% Radiation Damage over time. |
You’ll find Moon-Maddened Callis at the far end of the Elpis Orbital Shatterfield, a fast travel point you can unlock in the upper left area of Carcadia Burn after completing the main mission “Another Day, Another Universe.” This boss fight is very similar to the first Callis battle. She has two health bars for armor, followed by two for flesh, so using weapons that deal corrosive or cryo damage first, then switching to incendiary, is a good strategy. Callis behaves like a nervous scorpion, keeping her distance and attacking with her tail, and she also covers the area with a damaging red web. Players have reported difficulty getting her to drop legendary items, so she may not have specific loot and instead drops random legendaries rarely.
The Timekeeper
What Legendary Loot Does The Timekeeper Drop?
- Mission Required: The Timekeeper’s Order
- Boss Location: Upper Dominion, Dominion City
| Legendary | Type | Description |
|---|---|---|
| Timekeeper’s New Shield | Shield | Biniu – When equipped, grants Maximum Health, Health Regeneration/s, and reduces Damage Taken. |
| Symmetry | Sniper Rifle | Bilateral – Fires from reserve Ammo while charging. |
| Star Helix | Assault Rifle | Constellation – Projectiles can be fired vertically or horizontally. |
| Borstel Ballista | Sniper Rifle | Propagation |
You’ll find the Timekeeper in the Control Room at the very end of the Terminus District in Dominion, furthest from Upper Dominion. Reaching him involves taking an elevator and facing two final bosses. First, you’ll battle the Timekeeper, who uses teleportation, blinding attacks, and energy beams. He has three health bars representing Shield (Shock), Armor (Corrosive/Cryo), and Flesh (Incendiary). Once you defeat him, he transforms into the Primordial Guardian Timekeeper, with the same three health bars. This second form stomps around the arena, trying to defeat any Vault Hunter attempting to collect his loot.
Arjay
What Legendary Loot Does Arjay Drop?
- Mission Required: The Timekeeper’s Order
- Boss Location: Upper Dominion, Dominion City
| Legendary | Type | Description |
|---|---|---|
| None | n/a | n/a |
When you first fast travel to Upper Dominion, you’ll be able to reach Arjay, a boss located in a Phase rift accessible by grapple hook. Arjay is a challenging enemy, attacking with Rippers, Vile enemies, and damaging twisters. He has three layers of health: a shock shield, corrosive or cryo armor, and regular flesh which is vulnerable to incendiary damage. However, players have discovered that Arjay doesn’t drop any Legendary items, which makes farming him currently unrewarding. It’s unclear if this lack of loot is intentional or a bug.
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2025-09-15 03:05