I'd imagine the same way as any other holy order that shares your culture (the culture bit is important!). Give them land and ask for vassalization.
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I'd imagine the same way as any other holy order that shares your culture (the culture bit is important!). Give them land and ask for vassalization.
Nothing happens for me when i do that. I rolled back to 2.1.6 to play, and yeah. Nothing increases moral authority other than winning holy wars, winning rebellions, and holy sites
That's how MA is increased, other than converting provinces/rulers. What are you expecting to happen?
Something like the norse? Increased authority when i succesfull conquer a county perhaps? Some other mechanis that makes it not impossible to get 50% MA without having 4-5 holy sites? Since it is extremly hard to convert provinces. Which i understand, but it is nigh impossible.
Something you're forgetting is that, in CK2+, Unreformed pagans can raid, and looting a temple held by another religion increases your moral authority by 1% for 10 years or so for each temple looted. It's very possible to reform the celtic faith with only 3 holy sites if you do enough raiding.
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I think they get +1 if they use the county conquest CB in vanilla (and lose -1 if they lose the war) -- but that applies to all pagans. I don't believe we have that MA change in CK2+.
Now all we need is a possibility to convert to EU4 so I can colonize the world in the name of Ra! 