All of this is true. A company of the Thousand Sons were errant at the time of the battle of Prospero. The sanction fell and at The Emperors' behest the wolves were sent to deliver sentence. They were given full compliments of Sisters of Silence, and Custodians. Of The Emperor. Of Mankind. They smote ruination upon Tizca and destroyed the ocean of knowledge contained therin. The civilian populace and Prospine Spireguard were crushed without a single thought of mercy. It could have went differently. But it didn't. The Rout, as they are called from within, were chosen for this as they had seen its like before. This was nothing new to them. But that isn't why it had to be them. It is because of all the Legiones Astartes, they alone would not question the order once given. They burned Prospero completely. And they didn't blink.
2bad SW followed Horus orders and not the emperors...and they didnt crush the spireguard until the battle of the Fang
The order was sent from Malcador. And the spireguard that were killed in the Aett had never seen Prospero.
I would be glad to lend my claw to any chapter that would have me. Of course it is still aways away untill this game comes out. When it does, I will be happy to stand against all foes that call wolves enemys.
This Wolf Priest will guide the Fresh Blood Claws to their own great tales of victory! For Russ! For the all Father! Till the end of times to see Russ at the Wolf Time!