Nightmaw is accompanied by a shifting veil of darkness and shadows, which blur and distort his outline, and only at close range is the true horror of the creature's form apparent.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Enemy missile attacks suffer a -1 To Hit penalty against Nightmaw. In addition, Nightmaw must deployed within 3" of Sayl, but may otherwise move like an independent unit. Nightmaw does not award any Victory Points if killed.