I was reading a thread about barbarians being able to get fatigue immunity at level 9 with 1 Oracle / 8 Barbarian since you add your actual class levels to half your character level to determine the oracle curse feature.
I've looked at the basic multiclass rules and the variant multiclass rules and I see nothing about this.
Where are the rules for multiclassing that say you can do this?
Sorry if this has been asked already, my searches haven't come up with a link to the rules, only people talking about it working that way.