there is an outdoor map before the hell caves, it joins up at the end of border town where you cant get out, eg, left hand side exit to bw, down exit to PI boatman, right hand side exit to outdoor map with hell cave entrance, npc to battlegrounds is usually by the timestone on PI, read the updates doc, i'm sure theres a setting in the mapinfo table for the battleground maps to make mob tele to you.