Normally entering the caves would be suicide, since it is swarming with Myrmidex, who wouldn't hesitate to rip apart an intruder in their domain. However, after uniting the tribes, enough of the monsters were drawn away to battle, that the Avatar and the party managed to force their way through the remaining ones to the Myrmidex Queen. After killing her, they shattered the corrupted moonstone, thus ending the threat to Eodon and in proxy, Earth as a whole.