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Mantid Swarm
Defeat Raigonn without killing any of the Mantid reinforcements.
Mantid Swarm requires you to defeat Raigonn in Gate of the Setting Sun without killing any of the Mantid reinforcements that spawn during the fight.
Enter Gate of the Setting Sun
This achievement can be completed on Normal difficulty — Heroic is not required. Enter Gate of the Setting Sun and proceed to Raigonn.
Let Adds Spawn First
Do not burn Raigonn down too quickly. If he dies before any Mantid reinforcements spawn through the crushed gate, the achievement will not be awarded — pace your damage to ensure adds have time to appear.
Tank Reinforcements, Ignore Them
Have the tank collect all Mantid reinforcements coming from the crushed gate and keep them away from the group. Do not kill any of them — leave them alive for the entire encounter.
Defeat Raigonn via Weak Spot
Send DPS up to Raigonn's weak spot using the cannons, then kill him as normal while a fixated party member kites him. Avoid the locust swarm by staying out of the red circle on the ground.
Tips
See the video guide for a full visual walkthrough of this encounter.