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 KRakarth wrote:

Chaos
Chaos Players may choose to restrict their army by not allowing one or more of the following Keywords in their army: Khorne Tzeench Slaanesh Nurgle
Eg a player could choose a mono god army and not have to include or be permitted to take units from any other god (should Abaddon be exempted as he carries all 4 marks?)

The word you want there is "detachment", not army. Because the codex forces a player that actually wants to field multiple colors of Chaos (in the name of variety), to put each color in a separate detachment if they want to avoid being useless.

Craftworld eldar are hit particularly hard, as we have many different units, but at least 60% of them never see the table because they are absolutely terrible for any purpose whatsoever. Not to mention not being able to take minimum two fire prisms makes them pretty worthless as well.Can I make an army in your format? probably, but it wouldn’t be a particularly good one, even by casual standards.

This is very much a "strong get stronger" solution.