Weird Boyz are effected by the Shadow in the Warp

• Tyranid 8th ed codex:

"The first world of the Octarius Sector to feel Leviathan's hunger was Orrok, Above the Orks' settlements, thunder rumbled and the skies turned from blue to black as bio-ships entered orbit. Weirdboy psykers began to gibber in fear - something was clawing at the backs of their brains, something with an infinite hunger focused upon the Orks like the eye of a starving predator. Then the storm broke."