Frost Giant

If one has four arms in a warrior culture make sense he is a leader. Seems a huge advantage in close combat.

I once started a story about a primitive warrior culture were every male had four or six arms. More arms you have, bigger and stronger you are and best your chance to be head of your tribe. Some men in this society would have one arm extracted in a ritual of amputation and became shamans, so this people considered odd numbers a sign of mystical power and spiritual wisdom. Most shamans has either three or five arms, but naturally my story was about one who had only one.

Multiple arms seems a promising theme. In a transhumanist culture I would certainly have at least four (supposing I could pay for them)