Undead

Mountain range Rovero was the closest land monsters had fully inhabited to Kera city, west of the Capital. It began south of Kera and ran the western edge of the Yalveran Union that faced the Great Blood Ocean. 

A series of mountains and hills that contained many valleys and forests in-between. These became danger zones because of the uncleared dungeons it contained and wild monsters' hordes. 

The reason Arthur liked to hunt here is that after he got his latest rune, fleeing became a lot easier. There was also the fact that this place was unmonitored by the Union, only sending guilds to regularly clear its periphery and report unusual monster activity. 

Using his Teleport rune, Arthur scouted the village Dimon took him to. There were no signs of humans there, only wild monsters like wolves or bears roaming around. Using this chance, Arthur took his goblins toward the village, transporting away everything they needed to in his subspace.