Defend Colony 6 - Reptile is a quest in Xenoblade Chronicles. It is received automatically when the party has access to Eryth Sea and the reconstruction reaches 35%. This quest requires the party to kill five Fiery Ignas at the Ether Planter located at the crossroads southeast from Freight Road. They can be found near the cliff on the east side of the road, close to the point where the the paths from the Pod Depot and Freight Road intersect.
"You eliminated the threat of the raging enemies that had appeared by the ether planter."