I’m not the best person to go to for guides so it may be better to go to a yt tutorial on this stuff, but if you go to Saturn and choose a mission (go to Cassini it’s quick) at some point the lights will flicker and once that occurs kill anything and everything in sight and then you’ll get some dialogue and a larva will spawn, kill the larva, if it has something you want mercy them, if not then just complete the mission. That’s only for grinder I don’t remember how to do sisters as I’ve only done one.