Act One of Path of Exile 2 introduces a haunting blend of tragedy and danger, and few moments capture this better than your encounter with Lachlann of Endless Lament. Once a grieving man seeking answers, Lachlann's sorrow curdles into rage when he discovers the truth about his lost family. His anguish transforms him into a powerful undead boss, forcing you into a battle that's as emotional as it is deadly.

This guide will break down everything you need to know. Mastering this early boss is essential, especially if you want to start farming POE 2 Currency and building your character for the challenging acts ahead.
Where to Find Lachlann of Endless Lament
You'll encounter Lachlann in the Memorial of the Lost, a sub-area of the Cemetery for the Eternals. This eerie section of the map is filled with undead enemies, frozen corpses, and lingering sorrow, perfectly setting the stage for Lachlann's tragic story.
Before you can access his chamber, you must unlock the gate blocking the way by progressing through the Sorrows Among Stones questline. Once inside the Memorial, prepare for a tough fight, Lachlann is no ordinary undead. His transformation into the Endless Lament makes him one of the hardest-hitting early bosses in Path of Exile 2.
If you've been diligent about exploring and collecting POE 2 Currency, such as Orbs of Transmutation and Scrolls of Wisdom, now is the time to use them. Make sure your gear is upgraded, your flasks are ready, and your resistances are solid, particularly your cold resistance, which is crucial for this encounter.
Understanding Lachlann's Attacks
The battle against Lachlann takes place in a tight, enclosed arena, forcing you to stay alert and position yourself wisely. The primary danger in this fight isn't just his direct damage, it's the frost trails his attacks leave behind. These chilling effects linger on the ground, slowing your movement and making it difficult to dodge follow-up attacks. If too much of the arena becomes frozen, your mobility will vanish, and so will your chances of survival.
At the beginning of the fight, it's best not to go all in. Spend a minute learning Lachlann's attack patterns. Watch for his telegraphed motions, they're deliberate, giving you just enough time to dodge if you react properly.
One of his most dangerous moves is when he draws souls from the ground before hurling them toward you. The trick to surviving this attack is smart positioning: move to the opposite side of the central tomb so the soul projectile collides with it. When the soul hits the tomb, the attack cancels out entirely, leaving no frost trail behind. This simple maneuver will make the rest of the battle much more manageable.
Mid-Fight Phase Changes
Once you've reduced Lachlann's health below roughly 66%, the battle intensifies. He'll gain access to several new frost-based abilities, each with a larger area of effect and deadlier potential.
His upgraded attacks can quickly overwhelm the arena if you panic or lose control of positioning. The key is map management, direct his frost attacks toward the center of the room whenever possible. This way, you'll gradually push the icy zones inward, keeping the outer ring of the arena clear for movement and kiting.