The only thing worse than a goblin in Dungeons & Dragons is a whole ambush of them. As long as you keep the mechanics the same, most DMs worth their salt won't care if you flavor your barbarian's rage ...
If there's one thing Dungeons & Dragons ... odd that a barbarian is the one with a lot of magical subclasses. That's why it would be a good idea to have a non-magical barbarian, perhaps one who is ...