Hrm, maybe you should include a condition (for instance lvl1 of Dark Commander skill) for the book to appear, otherwise it doesn't make a lot of sense.
Also here's the last language fix:
Code:
special_darkway_name=Shadow Step
special_darkway_head=^special_tC^[Good]
special_darkway_hint=^special_t^Passing through the Plane of Shadow, Darklings may move up to 4 hexes in any direction.
or
Code:
special_darkway_name=Way of Darkness
special_darkway_head=^special_tC^[Good]
special_darkway_hint=^special_t^Move 3-4 hexes in any direction through the hidden passageways of the Shadow Realm.