This quest is available around the midgame, and tasks you with killing 5 Blazing Lophids in Cauldros. Specifically, they're located at White Phosphor Lake. I'm having a lot of trouble with this - the Lophids themselves are around Lv25 and shouldn't be any problem in a skell (or too much trouble on foot). However, White Phospher Lake is home to Trueno, The Cataclysm, a giant Lv60 Tyrant who has a sound-detection range across the entirety of White Phosphor Lake when in a skell, and is a one-hit kill against Lv40 skells. On foot is also unfeasible, as white phosphor deals 1,200 damage per second (Trueno also often aggros when fighting occurs around it).
There are only 3 Blazing Lophids in White Phospher Lake, making me believe the brute-force option (come back at Lv60, kill Trueno, kill the three Blazing Lophids, repeat) is not the intended path, as it would require killing an endgame tyrant twice to complete a midgame low-reward mission. Is there a better way to approach this mission?