Transported: The ruby is alive

Tom was an ordinary man with an ordinary hobby, metal detecting. Until he finds a golden disc with a ruby in the center, before he knows what's going on Tom is transported to a world he knows nothing about, thrown into a battle he has no stake in and is forced to trust people he has never met. Escaping with his life after arriving, he finds out he is now a pirate captain. Smile, it gets worse Tom!