It is sometimes named Death Elemental - although it is not a real Elemental - and has the appearance of a huge, hooded skeleton. The Mardagg is armed with an enormous scythe and is, when summoned, determined to only one purpose - the killing of all living creatures in the name of the Blood God.
It can manifest as a10 feet tall robed and hooded skeleton armoured in chainmail with a huge Scythe. [1a]
It can not be hurt by non-magical weapons and Necromantic magic does not function within 10 yards of the Daemon. A creature killed by the Mardragg can not be restored to life by any means or magic. [1a]