[Kaela_Mensha_Khaine]

The only reason i can find for giving warp field to a Hive Tyrant is that, as a multaple genus tyrant, it can then take all the other biomorphs, as it has a limit on the amount of biomorph enhancements, and taking extended carapiece counts towards this limit, so you cannot use one of the other biomorphs (e.g. Toxin sacs). Whereas with Warp Field you can get a 2+ save and have all the other biomorph enhancements...

Otherwise both are exactly the same, but warp field is, bizarely, much more exspensive. Nut a Tyrant is definatly allowed to use Warp field. :shifty:
(or both if you wanna waste points :huh: )