I need some stats for a medium sized land based bird for use as a mount. Specifically, a Terrorbird.
My best idea was to try to rework a Clawfoot for pathfinder and just change it's look, but I'm not sure what to add/remove mechanic wise. I would probably give it a beak attack, and I'd like to think these things are faster than a human, but I'm not sure. I also don't really know how skill ranks and feats should work for it, or how it's BAB, saves, and such would scale, as I'd like for it to level up with the PCs. Any relevant advice would be helpful.