The Underpin Delve Guide (Demolition Dome)

Demolition Dome is a unique delve in Patch 11.1, featuring a single challenging boss, The Underpin. This delve is the latest iteration of Zekvir’s Lair, maintaining two difficulty levels: ? and ??.

• The ? difficulty has a recommended item level of 639, introducing players to the boss’s core mechanics.
• The ?? difficulty is significantly harder, with no recommended item level, making it a true test of skill where frequent wipes are expected.

Like other delves, Demolition Dome can be tackled solo or in a group, giving players flexibility in how they approach the challenge.

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Demolition Dome Location

Demolition Dome is found in the northernmost part of the Undermine Zone.

📍 Entry Coordinates: /way Undermine 52.16 9.24

The Underpin’s Mechanics

The Underpin is a formidable foe who can randomly appear in tier 8 or higher delves. If you've encountered him before, you may already be familiar with some of his mechanics. Below, we break down his abilities in both ? and ?? difficulties, with key differences noted for the harder mode.

The Underpin’s “?” Difficulty Abilities

This is the more accessible version of the fight, but it still poses a challenge. Here are the core mechanics to prepare for:

• Crush – The Underpin leaps into the air and slams onto a target, dealing heavy physical damage and stunning for 4 seconds.
• Flamethrower – Locks onto the closest unit and unleashes a frontal cone of fire, dealing high damage and applying a damage-over-time effect.
• Time Bomb Launcher – Launches several bombs that explode after 10 seconds in a 15-yard radius. These bombs can be kicked at Signal Cronies to deal damage.
• Signal Cronies – Summons 3 Cronies around the arena, applying constant ticking damage and casting Molten Cannon, which fires orbs at players that cause moderate damage and knockback. Defeated Cronies leave burning ground effects.
• Divert Energy to Shields – At 100 Energy, The Underpin activates a shield and begins a 25-second recharge cast. If successful, this heals him for 25% of his health.

The Underpin's Abilities in ?? Difficulty

Instead of gaining new abilities, The Underpin's existing mechanics are intensified, making the encounter significantly more chaotic:

• Time Bomb Launcher – Continually spawns explosive circles around the boss for a duration, making melee positioning more difficult.
• Signal Cronies – Now summons 5 Cronies instead of 3, increasing the number of threats to manage.
• Increased Damage & Health – The boss deals more damage and has a higher health pool, prolonging the fight.

The Underpin Strategy

Here are some effective strategies to defeat The Underpin:

✔ Stay Close to the Boss – This helps control Crush and Flamethrower placement.
✔ Use DPS Cooldowns for Shields – When he casts Divert Energy to Shields, quickly break the shield to prevent healing.
✔ Kite Around the Edge – Avoid standing in the fire left by defeated Cronies.
✔ Bind Interact Key – Makes it easier to interact with bombs and kick them at Cronies.
✔ Reset the Encounter if Needed – If Cronies spawn in unreachable areas, resetting can save time.

Recommended Brann Build

For this encounter, set Brann as Damage and equip:

🟢 Goblomagnetic Bouncing Grenade or Mechasaur EZ-Build Kit for combat.
🔵 LOOT RAID-R as a utility curio.

Brann should be at level 50 or higher for optimal performance.

Demolition Dome Delve Rewards

Defeating The Underpin grants various achievements and rewards:

🏆 My New Nemesis – Awards the Golden-Gob Propulsion Rig mount.
🎩 Brann’s Spare Hat – Obtained by completing the Defeating the Underpin quest.
🔧 Pacifist Rig – A utility curio dropped by The Underpin.

Exclusive Rewards for ?? Difficulty

🏅 Breaking the Bank – Grants the Real Deal title.
🏆 Delver's Gob-Trotter Schematic: Gold – Rewarded for soloing ?? difficulty, allowing a gold transformation for the Season 2 delve mount.

Conclusion

Demolition Dome is a challenging delve with a tough but rewarding boss fight. Whether you’re tackling The Underpin solo or in a group, mastering his mechanics and optimizing your build will be key to victory.