Just having the armour isn't enough - in order to proceed within the cave where you can find the teleport to this Easteregg Larian area, you need these 4 treasure maps - and as if this isn't enough, you need even more - details will come, don't worry. The next pics will show the location of these maps, save one: the map you can obtain from Mpenzak, the trader in Verdistis. Depending on how far you are in the game, you can either find him next to his waggon in Verdistis NE, in or standing in front of the south entrance of the Ducal Inn.