Board Thread:Warhammer 40k General Discussion/@comment-8257990-20130821144250/@comment-7232811-20130821212054

As far as I can see Du'un, the warp does exist outside of the milky way galaxy, but it is not in the state that it is in the current galaxy. It is in the pre-realm of chaos state as it were, where it is simply roiling energy, due to there being no sentient life outside of the galaxy. It would be interesting to see what it would be like in another galaxy though, & what the effects there would be like (if there was sentient life of course).