SkuDal

Use Meglos for rockwell tho, with a rock drake and good shotgun for the tentacles

what about the overseer fight tho?

should be able to do gamma manticore ez, for rockwell i would use megalosaurus, and ride on rockdrake (with v good stam) with a acendent shotgun (from loot drops) taking out the tentacles. When all tentacles gone whistle megalosaurs on rockwell. Repeat this until rockwell dies.  Personaly i would use therizinos for overseer bc they are faster and have higher dps. Rexs also tend to be too slow and can't catch the overseer... or so ive heard. As long as you have a good kit and prepered to it on foot in case things go south you should be fine.

Btw ive never done the overseer fight yet but got this info from yt videos, other threads and reddit posts.

Are magmasaurs viable in the tek cave? I know they have resistance to lava but not sure if actually useful.  Are they good in overseer fight?