We visited the iceworm cave in Ragnarok. We went with 4 guys and a lot of firepower. It was a bit overkill thou as a good shotgun could shred them. The rest was all firearrows. We got 4 iceworm horns out of it and a ma quetzplattform saddle bp. Not bad.
I wonder if those mantis, once tamed with the horns, actually do lay eggs or if they need desert tiles for that. Does anybody know?