- Underkeep all bosses use positioning, movement, and fast mechanic recognition.
- Gargant requires front-cleave awareness, sandfall tracking, and orb dodging.
- Soldier S0 tests quadrant positioning, clone timing, and spread discipline.
- Valia Pyrrha combines orb paths, turret lines, electric fields, and party markers.
- Best habit: resolve mechanics in order instead of reacting to every visual effect at once.
Underkeep all bosses: Fight Flow and Preparation
Underkeep all bosses are built around readable telegraphs, arena positioning, and coordinated movement rather than strict damage checks. This Level 100 capstone dungeon becomes much easier when the party keeps the arena organized and identifies each mechanic before moving.
The dungeon is unlocked through the main scenario quest Descent to the Foundation. Before entering, make sure your hotbars include defensive cooldowns, interrupt or utility actions where applicable, and movement tools that can help during overlapping mechanics.
Video Highlights:
- Gargant’s Aerial Ambush and sandfall positioning
- Soldier S0’s final-clone cleave pattern
- Valia Pyrrha’s Coordinate March and turret combinations
- Practical movement advice for a smoother clear
| Encounter | Main skill tested | Party priority | Mistake to avoid |
|---|---|---|---|
| Gargant | Tracking and orb movement | Keep the boss near center | Standing in the frontal cleave |
| Soldier S0 | Clone identification | Move to the safe side | Following every clone |
| Valia Pyrrha | Layered positioning | Resolve mechanics sequentially | Panicking during combined attacks |
Tanks
- Keep bosses positioned centrally when possible.
- Face frontal cleaves away from the party.
- Use mitigation for heavy tankbusters.
Healers
- Prepare for repeated raidwide damage.
- Restore health after large arena-wide attacks.
- Watch for stack markers and tank damage.
Melee DPS
- Stay behind or beside bosses as mechanics allow.
- Avoid greed during movement-heavy casts.
- Return quickly after resolving mechanics.
Ranged DPS
- Spread when targeted by personal markers.
- Keep line-of-sight and arena awareness.
- Use available space without blocking allies.
Keep the first two bosses near the arena center whenever possible. Central positioning gives the party more room to dodge line attacks and return to melee range.
Gargant Boss Guide
Gargant is the first boss and establishes the dungeon’s main rhythm: survive raidwide damage, avoid the frontal cleave, then track the boss during Aerial Ambush. The fight is manageable when the party treats each mechanic as a separate movement problem.
| Ability | What happens | Correct response |
|---|---|---|
| Chilling Chirp | Raidwide area damage | Heal through the hit and regroup |
| Almighty Racket | Large frontal cleave | Move behind Gargant |
| Aerial Ambush | Boss becomes untargetable and attacks from the arena edge | Track the sandfall and leave the projected line |
| Earthsong | Two sets of exploding earth orbs | Find a safe space, then adjust for the second set |
| Trap Jaws | Heavy physical tankbuster | Use a defensive cooldown and recover afterward |
Chilling Chirp and Almighty Racket
Chilling Chirp is a routine raidwide attack. Healers should expect the party to lose health and prepare for follow-up damage rather than treating the cast as an emergency by itself.
Almighty Racket is more dangerous when the boss has drifted toward the group. Tanks should keep Gargant facing away from the party, while everyone else moves behind the boss as the cast resolves.
Aerial Ambush and Earthsong
During Aerial Ambush, Gargant becomes untargetable, climbs onto a pipe, and moves around the arena behind sandfalls. Watch where it stops. The boss later fires a wide line attack from that position, so the safest response is to move away from the projected path before the attack fires.
Earthsong adds exploding earth orbs to the movement challenge. The first orb set creates an initial safe space, but the second set requires immediate adjustment. Avoid locking into the first safe position; continue reading the arena until both explosions are resolved.
Stabilize the Arena
The tank keeps Gargant near the center and faces the boss away from the party. Everyone remains ready to move behind the boss for Almighty Racket.
Track the Sandfall
When Aerial Ambush begins, identify the sandfall where Gargant stops. Move out of the resulting line attack rather than chasing the boss.
Resolve the Orb Sets
During Earthsong, find a safe gap from the first group of orbs, then move again when the second group appears.
Mitigate Trap Jaws
Tanks use a defensive action for Trap Jaws. Healers should be ready for the heavy hit, especially if it overlaps with raidwide damage.
Do not stand still after identifying the first Earthsong safe spot. The second orb set changes the danger area and often catches players who stop moving too early.
Soldier S0 Positioning Guide
Soldier S0 focuses on precise positioning. Its most important mechanic, Sector Bisector, creates multiple afterimages, but only the final clone in the sequence performs the actual half-room attack. Learning this rule removes much of the apparent visual clutter.
| Ability | Pattern | Safe response |
|---|---|---|
| Field of Scorn | Raidwide damage | Heal and prepare for the next mechanic |
| Thunderous Slash | Magical tankbuster | Mitigate and keep the boss controlled |
| Sector Bisector | Clone sequence followed by a half-room cleave | Watch the final clone and move opposite it |
| Ordered | Line attacks leave one safe quadrant | Group in the open quadrant |
| Static Force | Conal attacks follow each player | Spread within the safe quadrant |
| Electric Excess | Circular markers on every player | Separate quickly and avoid overlap |
Sector Bisector
When Sector Bisector begins, Soldier S0 displays a series of clones. The afterimages disappear one by one, and the last remaining clone determines the attack direction. Ignore the earlier clones and focus on the final one.
If the final clone indicates a left-side attack, move to the right side. If it indicates a right-side attack, move left. This is a reaction test, not a memory test, so watch the final visual cue instead of guessing early.
Ordered, Static Force, and Electric Excess
Ordered places line attacks around the edge of the arena and leaves only one quarter safe. The party should move together into that quadrant. Static Force then targets players with conal attacks, so spread apart while remaining inside the safe area.
Electric Excess places circular area markers on individual players. It can follow Sector Bisector, requiring the group to first resolve the clone cleave and then separate immediately. Avoid drifting into another player’s marker while returning to a safe position.
The final Soldier S0 clone is the important one. Earlier afterimages are visual distractions and do not determine the resolving half-room cleave.
| Mechanic sequence | First action | Follow-up action |
|---|---|---|
| Sector Bisector | Move opposite the final clone | Re-center after the cleave |
| Ordered into Static Force | Group in the safe quadrant | Spread inside that quadrant |
| Sector Bisector into Electric Excess | Resolve the half-room attack | Separate for personal circles |
| Field of Scorn into tankbuster | Recover from raidwide damage | Keep healing and mitigation ready |
Valia Pyrrha Final Boss Strategy
Valia Pyrrha is the final encounter and combines several arena-wide threats. The safest approach is to process each mechanic in order: identify orb paths, avoid turret lines, find gaps in Electric Field, then resolve frontal or spread mechanics.
| Ability | Threat type | Response |
|---|---|---|
| Entropic Sphere | Raidwide damage | Heal through the attack |
| Coordinate March | Moving orb paths and cross-shaped explosions | Watch the path and avoid the impact zone |
| Turrets | Edge-based line attacks | Sidestep the active laser lanes |
| Electric Field | Ground cones plus player targeting | Find a large gap and avoid overlaps |
| Neutralized Lines | Frontal cleave with spread markers | Move behind the boss and spread |
| Deterrent Pulse | Line stack marker | Group together and share damage |
Coordinate March
Coordinate March sends purple spheres along marked paths. When a moving sphere reaches a pink orb, the impact creates a large cross-shaped explosion. Later patterns may move a pink orb before detonation, so check for an arrow indicator showing its destination.
Do not focus only on the orb’s current position. Follow the path and account for where the pink orb will move. This gives the party enough time to choose a safe lane.
Turrets and Electric Field
Turrets activate around the edge and fire line attacks across the arena. At the same time, Electric Field can create several ground cones and personal targets. Look for the widest available gap rather than attempting to move toward a fixed location.
The arena may appear crowded, but the mechanics remain readable when handled one at a time. First avoid the orb explosion, then move through the turret lanes, and finally settle into a safe gap for the electric cones.
Neutralized Lines and Deterrent Pulse
Neutralized Lines combines a frontal cleave with spread markers. Move behind Valia Pyrrha while keeping enough distance from other players to prevent marker overlap.
Deterrent Pulse is a line stack marker. The whole party must group together to share the damage. If it appears during another mechanic, prioritize reaching the stack while choosing a position that avoids the remaining arena hazards.
When Valia Pyrrha combines mechanics, do not react to every effect simultaneously. Resolve orb explosions first, sidestep turret lines, then handle the boss-facing and spread requirements.
Clear Checklist and Frequently Asked Questions
Use the following preparation routine before queuing and during the final pull. A clean clear depends more on recognizing patterns than on rushing damage.
Underkeep Clear Checklist:
- Keep Gargant near the center and avoid Almighty Racket from the front
- Track Gargant during Aerial Ambush and adjust for both Earthsong orb sets
- Move opposite Soldier S0's final clone during Sector Bisector
- Group in the Ordered safe quadrant before spreading for targeted attacks
- Resolve Valia Pyrrha mechanics in sequence instead of overlapping movement decisions
Identify the Cast
Read the boss cast bar and determine whether the mechanic requires spreading, stacking, facing, or movement.
Choose the Safe Area
Use the arena shape, telegraph direction, and remaining space to select a safe location before the attack resolves.
Resolve the Party Requirement
Stack for shared damage, spread for personal markers, or move behind the boss for a frontal cleave.
Return to Formation
Once the mechanic ends, return to a stable party layout so the next cast is easier to read.
A missed mechanic does not always mean the pull is lost. Recover your position, avoid adding another vulnerability, and prioritize the next mechanic over unnecessary damage.
Q: What is the main difficulty of Underkeep all bosses?
The bosses emphasize movement and positioning. Gargant tests tracking, Soldier S0 tests clone recognition, and Valia Pyrrha tests layered arena awareness.
Q: How do I handle Gargant's Aerial Ambush?
Watch where Gargant stops behind the sandfalls, then move out of the wide line attack projected from that position. Continue checking Earthsong orbs during the sequence.
Q: Which Soldier S0 clone should I follow?
Follow the final clone in the sequence. Earlier afterimages disappear without performing the resolving half-room cleave.
Q: What should the party do during Valia Pyrrha's combined mechanics?
Resolve the threats in order: avoid Coordinate March explosions, sidestep turret lines, find a gap in Electric Field, then handle frontal, spread, or stack markers.