The Wiki says something about a 38% chance to get one for breaking his wing but...
Damn. 6 Barioths in a row with broken wings and I still didn't get one. --- http://www.youtube.com/watch?v=YtYzsRMaQpo http://i169.photobucket.com/albums/u223/chocolateFRESH/arts/koola.png - Thanks Cosmonaut!
You are just unlucky. Trap him drop 2 bombs on one wing and blow em, then repeat for the other wing. They won't break from this unless they are large bomb+ then maybe, but they will be weak enough to the point where a few more hits will break them. Then get him limping and cap him for an increased chance in drops. I think it took me about 15 fights to get all the claws I needed for the armor and lance.
14 barioth kills.... not a single claw.... I break both wings every time, even went with the jaggi head last 2 times. fu** barioth. also, need a los plate as well.... yea.... dont even know how many kills of him ive done, atleast 10. no plate either.