Dweller Lord

The  is either the second or third boss you fight depending if you fight the Firefly Queen first. Killing this boss before you have an Auto-Builder MK V is fairly useless. If any turrets are nearby it will focus them down with rapid fire shots. The Dweller Lord drops the Dweller Lord Shell Spike, a key ingredient in the Defense Shield. Killing this boss is useful to entering the area under the volcano although not neccessary.

Location
The Dweller Lord is located inside the Volcano Mountain.

Strategy
The Jetpack is useless inside the volcano so place Platforms in layers over the boss in order to keep your distance. The Dweller Lord's shots are fairly easy to dodge using the platforms. Use a Health Regeneration Potion to keep your health up. Turrets are useless because the Dweller Lord destroys them very quickly. Recommended to use Overcharged plasma gun.