What is he up to in the grimdarkness of the far future?

>>54024659
Reddit rats aren't around in 40k, which is something I am eternally grateful for.
Unless you make the Hrud connection I suppose

>>54024659
Nothing, he's not even aware the warp is a cosmic space drill Tzeentch is using to penetrate through entire realities, Black Mesa Portals style.

Malal only hangs out with the Spacess Marine equivalent of the "Horde from where no one knows where."