An ancient civilization lived here, VERY VERY VERY advanced adnd the Eularians couldn't ever go to the surface to check it out.
Being multipurpose, and thusly explorational purpose, allows them to survive reentry
One of the tacterian ships survives, as they are meant to withstand such circumstances, They can even swim through stars for a short period of time. They were designed to be heat proofe, as there fusion shields just vaporize shots and such, causeing it to become a light, sort of dence, super hot vapor. That useually solidifies on the craft, giving it more armor.
They are all unmanned, of corse.
All Eularian exploration craft, including those given by the LSF and Tactarians, are sent through the atmosphere of Kirmos to attempt to get atleast one through the ship-vaporising air to the serface.
The Kirmoans are extinct, lol.
The tacterians notice all the refuges, and finds that even possunian refuges are landing, The tacterians notify the Eularians and Kirmoans that Kadiald (in floratorsat) has even less radiation, in hopes they will drive out all races except the possunians, than clear the gas cloud some. (because them and possunians are dire enemies)
A steady flow of refugees stream into the system.
Realizing they've lost, the remaining lexombies on the surface make a final stand. After fierce resistance against Eularian and possunian troops, the last few lexombies set off a bomb, obliteratng all troops nearby.