4m6s Trios Speedrun - Dharma-Ending Ruin - w/ Feria Shen

By making sure not to disrupt the attack chain of the hammer ents, you're able to take advantage of 3 Defuse Flaming Blade and 1 Defuse Raging Burn to kill them quickly. Aside from that, the majority of the speed comes from the mobber clearing the extras fast.