Hengus, Bologs, and Cachtorr are individual models and move independently, though they may not join regiments. In addition, as long as Hengus is within 8" the Giants, Bologs and Cachtorr may re-roll failed LD Tests.
Building an army? Create, validate and share your list with New Recruit, army builder for Warhammer Armies Project and many more games.
Try the builder