Board Thread:Warhammer 40k General Discussion/@comment-92.97.77.182-20130321145115/@comment-25451195-20141011074238

i have no idea where you heard or read that, but spikes to a limited number were used pre heresy as minor decoration (referense some catphracti model terminator armor)

Spikes are used by any one who wants to mount a head on it (see Abbandon)

mind you i am not in the know on the last two editions of the Chaos Rule books, so if that is stated some where, let me know.