I absolutely hate Stellaris now - The Grand Archive & Cosmic Storms Experience

[Eladrin]

Speculating here but the void worm crisis is different to others since it’s initiated if the galactic worm population reaches a critical mass. That sounds far more random than other crises. Also on lower difficulties the AI empires would have a harder time clearing out fauna which might mean the void worms reach that threshold earlier.

I'll be investigating this possibility. Most of the time the AI is pretty good at protecting themselves from them until the plague.

When voidworms are not in crisis mode, they obey a naval capacity limit, but if they're a crisis that limit is removed - this looks like this voidworm plague was overwhelmingly successful at bombarding many planets.

As a mid-game crisis, they're the equivalent of the Gray Tempest, and it looks like it won. It is kind of surprising to see them at this strength, but like some of the other mid-game crises they're time limited through the situation.