Deathbone rod

Cost: 22 gp
Weight: 2 lb.

A deathbone rod is formed from the bone of an undead creature that is no longer animate.

Energized (necrotic) (When you use an attack power through an energized implement, you gain a +2 bonus to damage rolls if the power has the keyword that matches the implement’s damage type. The bonus increases to +3 at 11th level and +4 at 21st level.).
Undeniable (You gain a +1 bonus to attack rolls against Will when attacking with an undeniable implement.).

Rod (If you are a member of a class that can use a rod as an implement, you can apply its enhancement bonus to the attack and damage rolls of any of your powers from that class that have the implement keyword, and you can use a rod’s properties and powers. Members of other classes gain no benefit from wielding a rod.
A rod is a short, heavy cylinder, typically covered in mystic runes or inscribed crystals. As with most other implements, you can’t make melee attacks with a rod.

Published in Player's Handbook 3, page(s) 195, Mordenkainen's Magnificent Emporium, page(s) 40.