Nexus Point Xenas Mythic+ Dungeon Guide

This encounter heavily focuses on space management, with multiple different abilities that will limit your group's positioning. First up are the Leyline Arrays, which are positioned on the outer edge of the platform and occasionally cut across the room, dealing arcane damage and slowing anyone who crosses them. Luckily you are able to stop these beams thanks to the Reflux Charge ability, which deals DoT damage to the player until they come into contact with a Leyline Array, at which point it explodes, stunning the player for a second while also removing any beams you were in contact with. This means that if any of the beams are overlapping you’ll want to prioritize standing on that intersection to open up the most space possible.

Outside of these beams, the other main source of area denial comes in the form of puddles, which are spawned by 2 different abilities and persist for 75s without any way for your group to clear them. Flux Collapse is the most frequent cast, which causes several 2yd circles to target a single player over a few seconds, where each leaves behind a small puddle. The other source of puddles comes from Corespark Detonation, which the boss casts at full energy, hurling a massive orb at a random player that knocks everyone back, applies a DoT that persists until a large healing absorb is removed, and leaves behind a massive puddle covering the impact zone.

Since both of these abilities are targeted on players, I recommend baiting puddles near the edges of the room or close to existing puddles whenever possible in order to maximize your room. On top of that, your whole group will want to watch their positioning after Corespark Detonation has locked in a location, as you want to avoid being knocked into any puddles or through any leylines. This is also the best time to use things like group defensives or healing cooldowns, as the DoT damage can be quite heavy if the healing absorb isn’t quickly removed.

Outside of this, tanks beware that this boss does not use melee swings, instead hitting the tank for arcane damage with the instant cast Arcane Zap ability.

After defeating a couple waves of trash at the end of the wing you’ll finally be able to take on Corewarden Nysarra herself, who notably starts the encounter at only 60% health. Don’t be fooled by the relatively low percentage though, as the actual health value is much higher than a normal boss due to a massive 300% damage amp during Lightscar Flare, which happens roughly 30s into the encounter and then every 1min after that.

When this happens Lothraxion will appear, aiming a beam of light at the boss that will deal damage to and disorient anyone hit for 5s, so make sure to avoid it. After that the boss will be stunned for 18s while shooting out a cone of light, dealing damage to anyone inside it while also providing that previously mentioned 300% damage amp in addition to a 30% healing amp.

Because this damage amp is so large it’s very important that you line up your cooldowns with it, which includes healers as the entire group will be taking a significant amount of damage by standing in the frontal effect. If absolutely needed don’t be afraid to briefly step out of the effect to stop your damage intake, but obviously the less you need to do that the faster you’ll defeat the boss.

As for the bosses other abilities, the group damage comes from Eclipsing Step, which puts a large AoE around 2 players that applies a DoT to anyone hit, so make sure you spread away from your allies and use a defensive if needed.

On top of this the boss will intermittently summon mobs with Null Vanguard, which brings out a Dreadflail and 2 Grand Nullifiers which we discussed earlier. Tanks will want to make sure to quickly pick these mobs up and point the Dreadflail away when they gain Void Lash, while everyone will want to keep interrupts on the Grand Nullifiers. It’s important that you cleave the adds down before the end of the damage amp phase, as once the boss becomes unstunned they’ll use Devour the Unworthy on any remaining adds which you want to avoid.

Outside of that there’s a tank channel in Umbral Lash, which not only knocks back upon concluding but also applies a 50% damage taken increase for 10s, which can be very dangerous when adds are alive, so make sure you have good defensive coverage on those overlaps.

Once both Lingering Images on the boss platform have been defeated, Lothraxion will jump down to the platform and you’ll be able to start the encounter. For tanks you’ll be dealing with a familiar ability in Searing Rend, though notably the puddles that the boss version leaves behind do remain for the duration of the encounter, so you’ll want to try and drop these out of the way, particularly if you didn’t clear the entire boss platform.

For some additional area denial as well as group damage there’s the Brilliant Dispersion cast, which targets 3 players, dealing damage and applying a DoT to anyone within 8yds, while also spawning 2 Fracture Images each. You’ll want to make sure you loosely spread to avoid cleaving, use defensives and healing cooldowns as needed, and that you steer clear of these images as they will lash out at anyone who comes within 5yds with Mirrored Rend, leaving behind additional puddles and knocking them back. To make avoiding them a bit more difficult, occasionally the boss will use Flicker, causing some of these images to dash in a line at a random player, so be ready to avoid this attack.

The last major ability is Divine Guile, where the boss jumps away, disguising himself among many clones while dealing pulsing group damage. To end this intermission you need to find the boss and interrupt him, but be careful because if you interrupt a clone it triggers Core Exposure which makes it much harder to survive.

In terms of how to identify the correct mob, the boss will be the only one without horns of light on his head, so if you find a bald image that’s the one you need to interrupt. Some abilities like Hunter’s Mark allow you to cheat a bit, as this mark will remain above the boss's head even while he’s hidden, allowing you to find him almost instantly. After interrupting the boss the regular phase just continues as normal, and the fight repeats from there.