Located near Thermopolis, WY, the Stronghold is the last remaining significant refuge of Celtic halfgods (Leathdias) in the United States. Though the inhabitants live in fear of being discovered, either by hostile forces from Camp Jupiter, Fomorians, or whatever other enemy may appear, the Celtic Leathdias remain strong, training their bodies and minds so they may preserve their way of life, even if it is against all odds.