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Pretty self explanatory, can I use a thunderbolt in a legion list? Im looking at finally buying one, and rather than just having a pretty model Id like to be able to use it with my death guard.

Yes, either ally in milita or solar aux, or take an orbital strike as a LoW choice.

Id completely missed the orbital strike low choice.
Do I use the crusade imperialis rule, or will I need to find a copy of imperial auronautica?

I just use the Imperialis militia rules since they are the most up to date, haven’t had an issue yet. For me like the Thunderbolt over the Lightning personally cause it’s better overall AA, and decent ground attack and retains a lot of firepower after it shoots off all its missiles. Good choice