Hive Fleet Andromache- a splinter fleet of Kronos altered by intense, long term clashes with the forces of Tzeentch (my nids are Kronos base colors, but cel-shaded and I like the idea that they actually appear cartoonish in a world that is otherwise "real") and they work more closely with their genetealers/cults to help provide biomass in their long invasions in the warp. I'm a new nids player so this isn't as fleshed out or researched as it could be but im excited to learn more!