You. Will. Die. (Seriously.)

Objective: Defeat Terramorphous the Invincible

Reward: Slayer of Terramorphous class mod

Strategy
Many videos on the internet may show Salvador beating this boss in record times by using Rampage and Gun Lust skills with either spamming grenades or by using a high-level shotgun and a fast-firing SMG to maximize the Keep Firing... skill.