So I just found out that there are a grand total of 19,173,960 Bloodthirsters, which are (were) the Greater Daemons of Khorne. Meaning that they were generally capable of devastating entire worlds and going toe-to-toe with Primarchs, or at least some of the more-decorated chapter masters or higher-ranking Astartes Legionaires (of the legions).
Not only can each individual Bloodthirster generally devastate a planet, but each supposedly commands their very own Legion of Khornate Daemons and Cultists, Daemon Princes, etc..
This means that Y/n has a FRACK TON of absurdly powerful daemons, and normal daemons at his beck-and-call. He could send them against Iron-Blood if he wanted too and they could even corrupt some people and start Y/n-cults.
Huh.
What if he did that?
. . .
Malal: No, MJ, don't do it . . .
Maybe . . .