Well Ross, if you are playing a pure tyranid army i would doubt the background of the Tyranids would allow you to field anything mechanical as the makeup of all tyranids is organic. However, Genestealer cults do use vehicles so I would check into fielding a detachment of genestealers for your army then it would at least be more to the background of your army. And nobody but Games-workshop knows what the necrons are going to do but my guess is that it was a failed attempt at an undead 40k army. I really do want to see undead in 40k, but ancient egyptian has been robots isn't really what I had in mind!(posted 9190 days ago)