Levy size boosted by 30%.
Also, unreformed Germanic Pagans get a 50% to retinue numbers, although I don't make much use of it before I flip the switch and reform the faith.
Germanic pagans also get their shipyards by magic when the Viking Age begins. And the head of their faith is a secular ruler much like Islam (although the Flykir can't hold temples without penalty).
I knew about the Fylkir, but not the Levy boost!
Maybe my next game will be Tengri...