You could even easily do tyranids in MMO format, and have advancement be through biological mutations.
Me and some friends got lost in the woods of Arcadia and spent four hours distracting ourselves from the walking by talking out how you'd make the game.
It would work so well its not even funny. Only thing we couldnt figure out was how to make Imperial Guard work as a balanced option. We thought about maybe a squad-based pet sort of control system, with your character being the Commissar or Squad Leader, but that seemed too finicky and difficult to make work. The other idea was give them access to powerful wargear like Plasma Guns or Sniper Rifles to compensate for their weakness, or else let them be able to make use of tanks, but that seemed like it would run into too many situational problems of the Guardsman being useless due to visibility, confined spaces, or general close combat.
We just couldnt justify letting a guardsman, even an officer or a Kasrkin Stormtrooper or Ogryn, be either as durable or as hard-hitting in close combat as a Blood Angel or an Orc or a Genestealer.
How do you not have the Imperial Guard though?
Beyond that problem, everything falls into place very easily. How do you resolve character death and let them respawn? Almost every race has a potential explanation. How do you give accessto increased mobility? Almost every race has some kind of jetbike, wartrak, drop pack, wing mutation, hellboard, land speeder, etc.
How do you allow specialization? Choice between the aspect temples, the castes, the chapters and company within the chapter, the chaos gods, the greenskin klan, the tyranid brood forms, the various cabals, etc.
Not to derail this thread......but thats a game somebody should seriously make.
They will end up very rich.
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