User blog comment:Menara/The Mark of Athena Character Art Revealed!/@comment-4430596-20120903194159/@comment-3146930-20120903200810

In mythology, his godly half went to Olympus and his human half went to the Underworld, unlike Dionysus who was a demigod and later turned into a god. Hercules is full god so he would be unable to defeat them himself. Maybe he thinks he can and ultimately fails, but I doubt his pride would prevent him from keeping the gates closed. The better question is how are the gods getting past him? (Aphrodite, Iris, and Hera for example)