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So, I'm thinking about using CSM allies for my KDK. Should I go for an Iron Warriors vibe (more vehicules and land raider) or Black Legion ? What's your opinion on the subject ?

Which do you like the color scheme more for?

There's no actual difference between the two because GW.

That said, the Black Legion supplement is garbage. If you want a Land Raider, take the Spartan Assault Tank instead and buy it Ceramite so that you cam avoid Melta drops.

So just go for the basic codex or the Crimson Slaughter supplement if you need them.

I've gotta say, taking either will probably be just taking yourself down a peg.

KDK are better than CSM straight up if you are not nurgle (then its a competition with nurgle bikers being T6 and all)
If only for the blood tithe giving out free boosts/units with little to no effort.

Crimson slaughters are a good option for getting in a few good artifacts because you also want forgeworld stuff.

Black legion only gives access to EW relic. Literally no other real benefit and several taxes to pay for it.

CSM base codex is flexible and underpowered. Axe of blind fury and black mace are the big grabs.

Crimson Slaughter has 2 nice sets of armor, and your psyker can get divination and your possesed get better and become troops. Almost no downside.

Daemons are a top tier army with multiple scary builds, usually flying MCs or hordes of demon psykers.

Renegades and Heretics gives you cheaper horde troops than IG with access to similar armor and artillery, and can still ally with IG. Use for gunlines or screening troops.

Everyone can take a Greater Brass Scorpion. Just saying.