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So I'm planning on running my IG army with quite a bit of armor and want it to stay alive as long as it can. I've seen some Guard players run a Tech-priest Engiseer in their army to do repairs, however its a Mechanicus unit. How does that work? Do I have to include a detachment of Mechanicus units to bring him?

There is a Techpriest Enginseer datasheet in the Astra Militarum codex.

The Tech-priest Enginseer has the Astra Militarum keyword and can be included in Astra Militarum detachments thanks to the Advisors and Auxilla rule despite not have a Regiment keyword.

 Iron Git wif da Hamma wrote:
So I'm planning on running my IG army with quite a bit of armor and want it to stay alive as long as it can. I've seen some Guard players run a Tech-priest Engiseer in their army to do repairs, however its a Mechanicus unit. How does that work? Do I have to include a detachment of Mechanicus units to bring him?

as others have answered, the enginseer has a datasheet in the IG list (35pts elite slot), seperate form the Enginseer in the AM list (55pts HQ slot), even though they share the same name and physical model.