I dunno what to think of the Unbidden. If they're just ridiculously OP, that could be fun in a drawf fortress sense, rallying the galaxy to hold them off as long as possible.
If they're not OP, they'll be a lackluster threat and a player will stomp them.
If they're really OP at first but there's story event driven buffs and debuffs for the galaxy, that'd be fun and climactic, but might feel somewhat like the game was on rails.
If the events were tied to certain conditions it might be more fluid in outcome while still allowing the player some level of control.
It has the potential to be really cool, i'm just wondering if it'll be implemented to its full potential.
All the screencaps are hype though, super excited.