From the Publisher:
Azagar’s Artifacts continues with Yarghul’s Rattle, a dire necromantic artifact created by the infamous gnoll necromancer, Yarghul Rotfang. Imbued with the awful power of undeath, the Rattle grants many terrible boons to those who pursue the dark path of necromancy. A mighty weapon in the hands of dark warlocks and wizards, Yarghul’s Rattle can summon the dead to do its wielder’s bidding or simply annihilate his enemies with blasts of necrotic energy.
Azagar’s Artifacts: Yarghul’s Rattle features the following new material for your 4E game:
Introduction by Azagar
Yarghul’s Rattle, a new paragon-tier artifact
A new wondrous item, the death rattle
Two adventure hooks to help you introduce Yarghul’s Rattle to your campaign
A handy reference sheet for players that dare to wield Yarghul’s Rattle