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Just want to make sure that I can use my Fellblade tank for my Grey Knights and receive all bonuses such as re-roll all hits if within Draigo's aura etc.

The Fellblade has the <Chapter> keyword but then I noticed there's a specific section in the Index for Grey Knights units aswell. So it made me question, in previous editions the fellblade was allowed for GK as far as I know so is it still legit to give it Grey Knights as the chapter keyword.

 Akaiyou wrote:
Just want to make sure that I can use my Fellblade tank for my Grey Knights and receive all bonuses such as re-roll all hits if within Draigo's aura etc.

The Fellblade has the <Chapter> keyword but then I noticed there's a specific section in the Index for Grey Knights units aswell. So it made me question, in previous editions the fellblade was allowed for GK as far as I know so is it still legit to give it Grey Knights as the chapter keyword.

No, The Grey Knights index list is invalidated for anything in the codex. Only units in the index listed or items in the codex may be GREY KNIGHTS.

Also, from the IA FAQ:
Q: Are there any restrictions on which Chapter I can choose
when replacing the <Chapter> Faction keyword on datasheets
within this book?
A: Yes. You cannot choose for any of these units to be
from the Legion of the Damned or Grey Knights
Chapters. They can be from any other Chapter though,
including Blood Angels, Dark Angels, Space Wolves
and Deathwatch.

Thanks