Set up a stone stair going around up the lowest pillar and then a ramp leading up to the closest spire thing. From their you can use some iron scaffolding and stone to make a little lox drop where you can lead 2 lox to cage up with a bunch of food and any baby lox will pop off down below to grow your might army against Yaggy.

That is what I did and against 1 Yagluth it was super easy. 2nd one probably kill off my army and then later on the double pair fights got rather quite tense even with the fall out shelters I made down below.