Well, dragon slayer pt. 2 would be awesome, but I really, really, really, REALLY hope that the next skill is not sailing. It sounds even less applicable than summoning and hunter did. I mean yeah, there are some cool stuff you could do with the concept like the ideas posted before this, but how would you train it? Tie knots? Do trigonometry to locate your position/destination? Honestly I can't think of a good method of training. I'm not saying this because I hate the idea of sailing, in fact I think it would quite nice, but I don't see how it would pan out well in-game. I would much rather have sailing as a new, more interactive and challenging method of transportation with links to existing skills, like was said earlier thieving by means of piracy and what not and maybe the use construction as the method to build and outfit your own player owned boat or something.