Out Of The Abyss Optons

[Fightmaster]

I'm starting Out of The Abyss Thursday and I had wanted to try something different for my character. I have an idea for a barbarian 5/tempest cleric 15. I like the idea of a barbarian who decides to embody the will of his clan's god and become a cleric. I'm fully aware this is unoptimal, but I'd like to give it a shot. What would be the best way for me to build this?

[NecroDancer]

Start off with 5 levels of barabarian then go straight tempest cleric and you should be fine. If your party lacks a healer go tempest cleric 3 (for prayer of healing) then take your levels and barbarian and finish up with cleric levels