Run. Ferocious creatures, the Lystro isn’t what it seems. It is a beast of bass destruction, giving a boost to tames along the way. Best to bring the shotgun and fight it with TEK armor for a minimal chance of survival. I’ve seen these things take down wild Gigantosaurs and Titanosaurs. Truly scary thing to behold. I once tried to tame one for the boost, I died trying. I had flak armor and was trying to passive feed it, but when I was about to feed it it turned around and one-spotted me. All of my tames died a second later. I had brought my Rex with me, he died.
They don’t really care if you take their eggs though.
Me and my tribe love our lystro. They honestly don’t have any use to us anymore as we have all maxed our levels. But these critters are certainly a nice form of company. To tame them you can take some mejo berries. I believe aquatic mushrooms may work too if you are on aberration.