Borderlands/New Haven

Like A Moth To Flame
This quest is unlocked in New Haven, but actually takes place in the ../Arid Badlands/. It's rated at level 21.

When you obtain the quest, return to Arid Badlands, and head to the location of the Lost Cave (about midway between Fyrestone and Dahl Headlands). There should be three torches that you will need to light to summon Mothrakk.

Mothrakk is a strong boss, especially if playing on the second playthrough or after-game. It flied high above at a distance, dropping fireballs at ground targets. The tactic is effective against those traveling in a straight line, as well as vehicles. However, Mothrakk is more tedious than difficult.

When attacking Mothrakk, you will need to lead your shots because of the slow bullet travel time. Not much leading is required, but you should at least see some progress on the lifebar.

To defend against fireballs, the easiest method is to take cover inside a building or Catch-a-Ride station, and poke out when you are at full shields. If you're in the open, move in a zig-zag pattern to cause the fireballs to miss.

The reward for slaying Mothrakk and returning to the bounty board is a cash reward of $8102, and The Blister, a unique caustic shotgun. The weapon isn't special beyond being guaranteed to inflict caustic damage.