Oh wow, well that sucks, I was fine with the relic being accessible only in a detachment of the Relic's cult....but being overall limited to only 1 Ritual of the Damned relic in the whole army it's really a bit too much.
Also note guys that the same crap partially applies to the extra Warlord trait, you can not give let's say the Cult of Magic Warlord trait to a Daemon Prince that sits in a Cult of Duplicity battalion
That was my thinking as well. If the belief is that you can only take one WL Trait from Cults, then you can't take a second Relic OR Trait.
I really don't think that's how it works. Basically the Trait (for example) says you act like a warlord for the purpose of taking the Trait. The Relic would work the same way. You're mimicking the role so you can access the asset in question.
Again, for the zillionth time this just adds to my frustration at how they decided to add this ludicrous restrictive element. It was totally unnecessary.
I've played over half a dozen games now .The restriction is built into the psychic phase and the powers themselves (in how they allow a target). The idea that 20 models may know a power for "Free" isn't that amazing in matched play when only one can cast it anyway.
It really is just clunky, and difficult for no real reason.