AI never attacks with collosus?

[bjamminloe]

Latest version of Stellaris, all DLCs, Ironman mode, no mods.

So I was at war with an Awakened Empire that owns a collosus. I was trying to get "Last, Best Hope" achievement. I very specifically left a planet wide open for destruction: the AE has conquered the starbase but not the planet, which was bordering the AE territory.

The AI moved the collosus around, but never offensively. I have wiped out almost all other fleets, hoping they will try for obliteration. After 100+ years, the stupid thing flew into a different system far away and was destroyed by an ally's basic, un-upgraded starbase.

Seriously, AI?! You'd rather have 13 fleets of <5k strength than 1 giant, useful fleet? Rather fly your planet killer nowhere near the helpless planet NEXT DOOR but head off across the galaxy to attack resource only systems... with no backup?

GRRRRRRR!!!!

[FirePrince]

I can only partially confirm this, BUT I had a game in which an NPC (Fallen Empire) used this extensively!! (unfortunately I cannot say whether this was due to a mod because I use a lot)

[FirePrince]

PS: Maybe it was because the Fallen Empire was already in a Total War (it destroyed 7 planets of another FE) Colossus is a very frowned upon weapon, it gives an extra Casus Belli.

[bjamminloe]

So I tried in another game.

I have a planet with nearly 30k army strength, no starbase, bordering the AE. I claimed AE systems and insulted them so they declared war on me. They attacked the bait planet immediately and besieged it. I wiped out their primary fleets so all they have left is a 10k fleet bombarding the bait planet and a 2k army in orbit.

The colossus went the OPPOSITE direction from my world! Deep into a thrall/ally territory and then moved back and forth between 2 systems for 124 game years before we made a white peace.

What is wrong with the AI?!?

I even cracked one of the AE colony worlds to draw the colossus into doing SOMETHING. No luck.

[Nightmyre]

https://steamcommunity.com/sharedfiles/filedetails/?id=1327370825

Pretty good summary of the best way to get it. I haven't got around to doing it yet, though I have a savefile which is pretty much ready to trigger the event. If you'd like, I can send it to you.