u/Lion_one_and_only

I didnt play in a year or so but I am slowly building my chaos knight army, I want to stock up rest before prices will increase.

So far I am having 7 wardogs (fully magnetize) and 1 knight ruinator in a box. What else should I buy? I am thinking 2 big knights?
I still see Eye of Terror Battalion: Imperial Knights in shops, but I am not sure if I like Castellan, never seen it live. My other options are Questoris or Ruinator right ?