Lagon - Ending The Storm Boss Guide

Lagon is a three phase fight that gets progressively more difficult. He also boasts a guaranteed one shot mechanic and several others that one shot most builds. Players need to understand how to properly position in order to defeat this boss.

In this guide, we cover the rewards, boss mechanics, and provide a strategy for defeating this boss.

For more information on the Timeline this boss is found in check out our Ending the Storm Timeline Guide.
For the campaign version of Lagon, check out Lagon - Act 8 Boss Guide



All timeline bosses have a pool of exclusive Uniques that can drop. They also provide the player with a Blessing, which is a permanent buff to either power or farming/leveling efficiency. Just like Uniques, each boss has their own exclusive Blessing pool.


Lagon can drop 4 different Uniques:

  • Alluvion has a 50% chance to drop. It is mutually exclusive to Coral Aegis, meaning you always get one or the other, but not both. It can drop from both normal and empowered versions. The drop rate is not affected by corruption.
  • Coral Aegis has a 50% chance to drop. It is mutually exclusive to Alluvion, meaning you always get one or the other, but not both. It can drop from both regular and Empowered versions. The drop rate is not affected by corruption.
  • Stormcarved Testament is a rare drop. The drop rate is increased by higher Corruption. It can technically drop off normal Lagon; however the area level must be increased to at least 78 for it to drop. We recommend farming this on Empowered.
  • Eye of Storms is a rare drop that can only be found in Empowered. Increases in Corruption improves the drop rate of this item.

See the Monolith Timeline Guide for more info on Corruption.


The Blessings of this Timeline are themed around Lightning, Cold, Ward and Stun with some exceptions. Some generally useful choices are:Bastion of Divinity, Cruelty of the Meruna and Rhythm of the Tide.




  • Bastion of Divinity
  • Chaos of Lagon
  • Crash of the Waves
  • Cruelty of the Meruna
  • Grace of Water
  • Intellect of Liath
  • Light of the Moon
  • Might of the Sea TItan
  • Mysteries of the Deep
  • Resonance of the Sea
  • Rhythm of the Tide
  • Trance of the Sirens
  • Weight of the Abyss
  • Grand Bastion of Divinity
  • Grand Chaos of Lagon
  • Grand Crash of the Waves
  • Grand Cruelty of the Meruna
  • Grand Grace of Water
  • Grand Intellect of Liath
  • Grand Light of the Moon
  • Grand Might of the Sea TItan
  • Grand Mysteries of the Deep
  • Grand Resonance of the Sea
  • Grand Rhythm of the Tide
  • Grand Trance of the Sirens
  • Grand Weight of the Abyss

Boss Mechanics

Moon Beam

Lagon rises up and then moves to either side of where the player was standing when he started. He then sweeps towards and across the player's original position with a beam that deals extremely high Cold and Lightning Damage at a high rate of fire and Chills. This attack is deadly for almost every build!

Moon Shot

Lagon lowers his head and then fires a quick beam in front of him, dealing moderate Cold and Lightning Damage. He only uses this skill when below 65% HP.

Moon Blast

Lagon rises up and places a large circle on the ground below him. After a short period he blasts the area with very high Cold and Lightning Damage and Slows. This attack one shots many builds!

Lightning Strikes

Lightning strikes random areas of the arena throughout the fight, dealing low Lightning Damage. A circular telegraph appears on the ground moments before the attack occurs.

Melee Attacks

Lagon strikes the ground in front of him with either his left or right claw, dealing moderate Physical Damage. His left claw (on your right side) is a guaranteed 2 second stun on hit.


During phase 2, Lagon's tentacles appear in the arena. They deal low damage Physical Attacks but have a high Stun Chance. You must kill these in order to progress to Phase 3.


During Phase 2 Flayer Sharks and Crabs spawn throughout the phase. Neither are a major threat but the Flayer Sharks can get dangerous if too many are allowed to accumulate.

Cold Waves

Starting at Phase 2 and persisting into Phase 3, these waves do a moderate amount of Cold Damage and serve as a gear check for the fight. Builds with low Cold Resistance struggle to overcome these. They can be dodged but their spawn rate is so high in Phase 2 that avoiding them all is difficult. They can be avoided in Phase 3 by hugging Lagon's side of the platform.


When you go into a timeline boss fight, you carry any modifiers that are active from running echoes. Some of these modifiers can be especially dangerous, while some can actually bring value with little or no downside.

Avoid These Modifiers

  • Critical Strike Avoidance - If you're a Crit based build and have sufficient Crit to be noticeable.
  • Enemies have +X Critical Strike Chance - Avoid these if you don't have capped Critical Strike Avoidance.
  • Enemies have a chance to Dodge - Any builds that rely on Hitting the enemy (including DoT builds that apply Ailments on Hit) should avoid this modifier (except for Rogues with Focus Fire).
  • Enemies heal if they have not been damaged recently - This modifier is so unfair on Lagon that it's been removed from the pool for his timeline. No need to worry about this one.
  • Frenzy and Haste + Berserk - Individually these are manageable (although you may still want to avoid them if you can). Together they can make a boss very difficult to deal with as they significantly speed up the mechanics of the fight. Don't take these unless you're comfortable with the mechanics and confident that the additional speed of the fight won't be a problem.
  • Increased Elemental Damage - This scales almost all of the damage in the fight and scales higher than other damage modifiers. The damage can get out of control quickly, especially at higher Corruption.

Take These Modifiers

  • Anything that affects Rare enemies - Bosses are not considered Rare enemies, so those modifiers do not apply to the encounter. However, the rewards do. This is an easy way to boost the value of a fight for any build without increasing difficulty.
  • Enemies have +X Critical Strike Chance when Crit capped - If you're Crit capped, then this modifier provides no extra difficulty.
  • Critical Strike Avoidance on a DoT build - DoTs can't Crit, so this won't matter.
  • Enemies have a X% chance to receive a Glancing Blow when hit on a DoT build - Similar to Crits, Glancing Blows only apply to Hits.
  • Enemies have a chance to Dodge on a build that uses a DoT skill - Ailments generally need to Hit to be applied, so don't take this if you're relying on Hits to stack your DoTs. However, some skills have the DoT tag, meaning they don't Hit. DoTs can't be Dodged, so your damage is unaffected.

Boss Strategy

Lagon is a three phase fight. In Phases 1 and 3 you deal directly with Lagon. In Phase 2 you fight adds while killing Lagon's tentacles. The fight is largely Cold and Lightning Damage, but also includes some Physical Damage so be sure to cap all three Resistances. There are several one shot mechanics in this fight, including one of the most punishing boss mechanics in the game, so knowing how to deal with these mechanics is vital to defeating this boss.

Phase 1

You start in the middle of the arena and need to run up the stairs on the left or right side to engage the boss. In the first phase Lagon has most of his abilities, including the most dangerous ones so you'll need to be on your toes from the start. Here are some general strategies:

  • Stand in the center of the platform. It makes a huge difference when trying to avoid Moon Beam.
  • Whatever you do, don't get hit by Moon Beam! This attack sweeps across a large portion of the arena and one shot almost anything. Lagon starts the attack by rising up and then repositions to either side of the player. The best way to avoid this attack is to stand and wait for Lagon to reposition himself (he will NOT start the attack on top of you if you stand in place), then move to the opposite side of the platform. Make sure you're near the middle of the platform when he starts the attack or you might not have enough room.
  • Do not get hit by Moon Blast. It's a well telegraphed attack with a big circle AoE so you shouldn't miss it.
  • Avoid his Melee Attacks, especially the left one (your right). It always stuns and could mess up your timing with more dangerous attacks.

Phase 2

Once Lagon reaches 50% HP he teleports you to the center of the arena. This phase has entirely different mechanics from Phase 1:

  • Lagon's Tentacles spawn throughout the arena that deal low Physical Damage and high Stun Chance. They must be killed in order to progress to the next phase. The moon in the center of the ring fills up as you kill more Tentacles and once it's full you are teleported back to Lagon where Phase 3 starts.
  • Flayer Sharks and Crabs continuously spawn. These aren't immediately dangerous but not dealing with the Flayer Sharks causes them to accumulate and potentially overwhelm you.
  • Cold Waves sweep from one side of the arena to the other. They do moderate Cold Damage and there are so many of them that it becomes difficult to avoid them all. Getting stunned from a Tentacle only makes avoiding these harder. Make sure you have capped Cold Resistance in case you need to tank a few.

Phase 3

After killing enough tentacles you are teleported back to Lagon. This phase is similar to Phase 1 but the Cold Waves from Phase 2 now cross from the left and right side of the platform. The easiest way to avoid them is to stand as close to Lagon's end of the platform as possible and slightly off center. The very center won't be far enough to avoid the waves but being too far off center puts you in danger of Moon Beam. The rest of this phase is the same as Phase 1 so avoid those mechanics along with the Cold Waves and you'll take down Lagon!


  • The Blessings for this timeline are themed around Lightning, Cold, Ward and Stun with some exceptions.
  • Lagon is a three phase fight with two phases involving Lagon and one add phase.
  • He has some of the most punishing mechanics in the game.
  • Cap Lightning, Cold and Physical Resistances
  • You need to kill the Tentacles to progress from Phase 2 to 3.
  • Whatever you do, don't get hit by Moon Beam!



Written by McFluffin.
Reviewed by Facefoot, Lizard_IRL, Raxxanterax.


Feb 5th 2023
Article created