Easily seen when driving towards Kalle from the E10, the Trolls\' Fortress is a big shady crag sat high on the south side of Trolldalen, the valley that runs parallel to Øvredalen over on the opposite side of the ridge. The main buttress of Trollfestningen is split in two by a grassy ledge at half-height. The lower section only has a couple of lines which need to be followed to gain the ledge. Above this, the upper section is formed from massive sheets of granite and has remarkably few natural lines, although the corner of Odins bue is the obvious feature. By far the most popular route here is the long line of Colibrien which can get congested since the lower pitches are also the common access pitches for the upper routes. Nipping up the crack of Fingerrisset is a useful distraction, and Spurven and Havørnen make worthwhile alternatives, albeit at a more difficult grade. Also covered in this section are a few outlying climbs on the other quality rock faces in Trolldalen.