The Warlord #1 (2009)

At the Roof of the World in Tibet, a team of paleontologists and adventurers has made the find of the century: perfectly preserved dinosaur specimens that appear to have died mere days before! Their expedition takes a deadly turn when they uncover an impossible portal to another world – an unbelievable country at the hollow center of the Earth, the mythical land of Skartaris! But they're not the first surface-worlders to find themselves stranded in Skartaris, and their arrival in his peaceful home triggers an unforgettable new adventure for the hero who has taken the land as his own: Travis Morgan, the Warlord!