Rage Prophet Savage Seer not stacking Barbarian/Bloodrager levels

[grzegski]

Hi!

Im working on a Rage prophet build [16Bloodrager / 3 oracle / 1 rage prophet]
with this, in theory i should count as a level 20 oracle for revelation abilities, but it seems to only be counting my oracle + rage prophet levels, not Oracle + Rage Prophet + Bloodrager (i also tested barbarian and had the same result) of only counting as lvl 4 for revelations. I was testing this using Spirit Shield.

I may be able to cheat this with a custom magic item cloned from a robe of arcane heritage maybe, but i haven't delved into custom item creation much.

Anyone have any workarounds for this?