While not needed, you can also loot the nearby skeleton for Pang of Conscience and a letter of apology. Climb up to the first level to find Hieronymus' notes in a chest, which will add the Ruined Watchtower and the Bastion as other areas to check out, as well as noting you need to examine the portal mechanism. Head in and go straight, climbing up over the wall, to find some scaffolding here. As you make your way up the steps to the tower a couple erynias may attack if they spot you here. However, as it's up a steep cliff, you'll need to ride down the valley some and then back up to get to it. The armor diagrams are in the old signal tower, an unmarked location just south of the Kaer Morhen signpost. The easiest way to get the markers on the map is to buy one of the maps, with the easiest one early on being the slightly torn notes from Lindenvale's blacksmith.
