Stillness is a skill in Radiant Dawn that, when assigned, makes enemies attack units other than the one it is assigned to. Some enemies are unaffected by this skill. It can only be used by Beorc and takes up 25 skill capacity. It is akin to Shade, only more effective at hiding the unit in question.
Volke comes equipped with this skill, though you usually want enemies to attack Volke due to his high offensive and defensive skills.