(Check dev diary 181 for more information) well, they allow you to make zombie armies. The final one is reanimated armies which. They also get bonuses for tomb worlds and relic worlds. There's also memorialist which allows you to build a building to change energy or consumer goods (depending on whether or not you're a hive mind) into science and unity. It doesn't sound too powerful to me but should be a ton of fun thematically. Instead of new pops though, you get empire wide bonuses. The most interesting part though is that you can build a building that sacrifices pops of secondary species to create new ones of your primary species which is how they get around the growth speed malus.ДЄs for the civics, one is death cult which adds a mini-version of that sacrificial chamber.

It also gives you a secondary species a la syncretic evolution and your habitable planets become inhabited by primitive species meaning within the first few years of the game you should have 4+ species within your empire. The origin does a bunch of stuff, most notably giving your species a buff that heavily decreases growth speed but decreases maintenance costs, increases specialist and ruler production and massively increases leader lifespan. So you get 16 new portraits but unlike Lithoids, Necroid mechanics aren't tied to it, instead you get a new origin and some death themed civics that any empire can use.

Stellaris 161 patch download