no, dark eldar are the ones that didnt go on the craftworlds and survived the fall. all they did was flee into the webway and found The Dark City.
the flame thing is similar to the Flame Falcons of the 21st cursed founding. members of the chapter, during one heated battle, spontaneously bursted into flames. it caused them no harm, and they thought it was the emperors blessing. they won the day, and later on as they celebrated back on their homeworld, the inquisition investigated and destroyed them all. |