Space Alien bugs ... special event. 0.2% chance of it happening in a single player game.
Comet-like object crashes to the planet. Becomes the "Hive Crater" ... where these "things" start spawning.
You get "biomass" from harvesting anything living -> trees, fertile land, scaths, horses, wild game, humans, fallen
small, and weak, no ranged attacks or magic. successful melee attack implants multiple parasite larvae in the target.
Harvesting a Shard can allow you to build large Cannon Bugs for 1000 biomass. Cannon Bugs shoot large projectiles of raw magical energy ... long range w, 1 tile radius area of effect.
enemies implanted with larvae have a 10% chance per turn of spewing forth an alien bug. Each "birth" of an alien bug causes 2^n damage per turn to the host. The host automatically receives 1 damage per turn for having alien larvae growing within.
Host can be an animal or monster, doesn't have to be sentient.
Alien Bug race is auto-hostile to everything.
Alien Bug tech tree is very simple ... unlock harvester buildings, unlock Shard harvesting, and finally unlock brain-bug
most buildings are different types of harvesters, with 2 other building types. Research building called "empath node" and a unique spawning pit called a "Breeder Clutch" ...
Breeder Clutches consume X biomass per turn for maintenance and spawn the basic combat unit at 50% chance per turn
Alien Bugs have no unit maintenance, or use for gold. Only biomass and research points. Biomass is used to fuel Breeder Clutches, Build new buildings, and Grow larger/ better units.
Brain Bugs cost 1000 biomass, have a lot of HP (100? 300? 1000?) and no physical attack. They have a lot of Mental-attack spells and abilities including charm, domination, fear, and confusion, as well as a few close-range special abilities.
Brain Bugs have 20 Intelligence, 20 wisdom, and 40 essence. They have +2 mana regen per turn.
Brain Bugs strengthen the combat abilities of the other Bug-types under their command.
Each Brain Bug increases the AI ability of the Alien Bugs.
Each Brain Bug increases the Brain Bug Army's line of sight by +5. The Fifth Brain bug eliminates Fog of War entirely for the Alien-Bug faction.
The first Brain Bug unlocks basic diplomatic ability for the Alien-Bug faction. The Fifth Brain Bug unlocks all diplomatic abilities.
If the Alien Bugs have X Brain Bugs, and one of them dies, they lose the abilities that having X Brain Bugs provided. (its dynamic, not permanent)