The Underpin is the “Zek’vir” of Season 2 and we’ve datamined all his abilities and the rewards you can earn in Patch 11.1!
During the Season 2 Delve intro questline, we learn that The Underpin has stolen Brann’s hat, and you are tasked to recover it! The main objective of the Defeating the Underpin quest is to increase your item level to challenge the Underpin in his Tier 8 Delve within Undermine.
Datamined Skills
We’ve datamined multiple skills tied to the Underpin. It seems his allies will have a chance to wander in your delve and defeating the group upgrades the Nemesis Strongbox found in the treasure room, providing additional rewards at the end of that delve.
Nemesis Strongbox – The Underpin’s allies are wandering about the delve. Defeating a group of these enemies upgrades the Nemesis Strongbox found in the treasure room. Providing additional rewards at the end of this delve.
The Underpin Abilities
Here’s a list of the Underpin’s full abilities:
Crush – The Underpin attempts to Crush his enemies with the full force of his mech, inflicting 50 Physical damage to players caught in the area and stunning them for 4 seconds.
Flamethrower – The Underpin attempts to set his foes ablaze, inflicting 2 Fire damage every 0.5 sec to players within 15 yds in front of him.- Flamethrower – Inflicts 20 Fire damage to all players in a 40 yd cone in front of the Underpin and causes all players in the area to burn for an additional 3 Fire damage every 0.5 sec for 5 sec.
Signal Cronies – The Underpin signals for his Cronies to assist him. (2sec cast, 1.5 sec cooldown)
Molten Cannon – Underpin’s Croney powers up his Molten Cannonand fires a powerful orb of molten lava at a player’s location which inflicts 30 Fire damage and knocks back all players caught in its path.
Disperse Crowd – Underpin’s Croney attempts to disperse nearby players with its shield inflicting 30 Physical damage and knocking back players in the area.
Black Blood Cannon – Underpin’s Croney powers up his Molten Cannon and fires a powerful orb of molten lava at a player’s location which inflicts 0 Fire damage and knocks back all players caught in its path.
Divert Energy to Shields – The Underpin diverts the his mech’s energy to shields, powering it down while it attemps to recharge absorbing 10% of health in damage while the shields hold but taking 100% increased damage while powered down. If Underpin successfully recharges his mech heals for 25%. (Costs 100 Energy, 2 sec cast, 1.5 sec cooldown, 200 yd range)
Oil Spill – Disrupting Underpin’s attempt to recharge damages his mech causing it to spill oil nearby every 0.5 sec for 5 sec.- Oil Spill – Damaging Underpin’s mech causes it to spill oil which causes players within to slide.
Achievements and Rewards
Completing 
Let Me Solo Him: The Underpin by defeating The Underpin in his lair on Tier ?? without any other player in your party, before the release of the next season of delves rewards the 
Delver’s Gob-Trotter Schematic: Gold for your Delver’s Gob-Trotter mount.
Breaking the Bank requires you to defeat The Underpin in his lair on Tier ?? before the release of the next season of delves. the achievement rewards The Real Deal title.
For 
My New Nemesis, you need to defeat The Underpin in his lair before the release of the next season of delves to get the Golden-Gob Propulsion Rig cosmetic back!
Ask Brann to change his hat ten times after recovering it from the Underpin during the War Within Season 2 to receive 
The Hataclysm.
