If wielded in melee, it's a +6 Unholy Chaotic Heavy Mace. If the wand touches any nonoutsider, or an outsider with less then 15 HD, the target must suceed at a Fort save (DC 25) or die immediatly. Anyone that touches the wand against Orcus' will must save or die as well.
It also confers a +5 deflection bonus to the Armor Class of the wielder at all times.
Finally, the wielder can call upon each of the following effects once per day, as the spells cast by a 20th-level caster: Abyssal Might, Bodak birth, Call Nightmare, Clutch of Orcus (DC 18), Summon Monstrer VII, Wrack (DC 18), and Wretched Blight (15d8 Damage, DC 23).