Nice Idea. But what kind of gods will we worship? Rick Riordan fans will want Greek, Roman and/or Egyptian, and then there is Norse... please answer
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It could be just fictional.
You don't need to have mythological background because these are barbarians we're talking about.
They worship whoever they want whether it be a being of higher power or just nature.
If they get serious with this, how about a naming contest (They give us the powers, we supply the name)
You did say the efect is permanent
Would the effects carry into the wars as well, or would they be nullified?