The God Breakers craftworld passed a long time on the edge of chaos. Without an Avatar and led by an evil farseer, their attacks were getting more and more savage and without other objective that war fever. After a bloody battle against another eldar warhost, a young but powerful female warlock, Ae-nea, had the revelation that the craftworld was about to fall definitly to Slaneesh. Secretly, she gathered loyal warriors and triggered off a rebellion. Eldars fought eldars for weeks in the giant ship. Finally, Ae-nea succeeded in passing through its enemy's psychic defenses and killed him in an ultimate warp explosion. Most of the loyalists surrendered then. Psykers fathomed them, those judged too dangerous were executed, the others were forgiven.
Once order restored in the craftworld, Farseer Ae-nea tried to lead it back on the eldar path. At this time, the God Breakers's craftworld is still convalescent, the warriors are still psychotic killers on the battlefields, but Ae-nea keeps them on the right way and ensures that they always fight for a fair cause. The skull of its former opponent is fasten on a rod to recall the fate of those who may chose Chaos and she always appears with her blade, Redeemer.
Now, if you want to know the color scheme of the God Breaker, check their Gallery