When one goes and uses a thunderlords nest or later the void jumpgate to travel, but then goes to the wilderness map the game puts the player where he started at so no travel actually occured, it just appeared to be so... this is a problem with the mines of moria map, as you can recall, but it will take you inside the mountains (even though te exit is '>' not '<') if you have been inside last. maybe you could cause a secret exit to the mine from inside, only if you have been inside and seen the non-exisant ruling place of that town...
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