Hi all, I am primarily a fantasy player and wanted to get back into 40k. I am going through my old noise marine army and have a pair of demon princes.

From what I recall of 40k comp/gaminess in that it's out the window compared to fantasy comp/gaminess, basically you can bring what you want. Is that still the case with regards to the lash? It seems rather awesome especially alongside a 4 blastmasters elsewhere in the army. Is it considered bad form to use it? What about 2?