The difference is you can give warp filed to a non-mutated tyrant (ie one chosen from the main list). It also counts as a psychic power, whereas extended carapace does not. Not that it makes much difference. Extended carapace is a much better option. Try giving mutated tyrants devourers. If they're mutated to S6 then thats 6 S5 AP4 shots. Possibly at BS4. S6 shots if the tyrant has exceptional size. Mad. I find couple of tyrant guard afford much better protection in games >1250pts.
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