When not warring against rival demon princes, Orcus likes to travel the planes, particularly the Material Plane. Should a foolish spellcaster open a gate and speak his name, he is more than likely going to hear the call and step through to the Material Plane. What happens to the spellcaster that called him usually depends on the reason for the summons and the power of the spellcaster. Extremely powerful spellcasters are usually slain after a while and turned into undead soldiers or generals in his armies.