Antis says "The rod's kind of a weapon. Might come in handy.

And, I want to look for my friend. He might be in there."

Spoiler: Eilyra
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It appears to be a

Rod of Force: This rod is made of black iron, 18 inches long and a half-inch wide. The rod has three functions, any of which can be used, in any combination, five times per day.
Blast of Force: A blast of force projects from the rod with a range of 100 feet. This is a ranged touch attack and deals 10d6 points of damage.
Wall of Force: As the spell.
Blade of Force: A 3-foot-long glowing blade of force springs forth from the rod that lasts for 10 rounds. This can be used as a +1 brilliant energy longsword.
CL 13th (Strong Evocation); Craft Rod, magic missile, Mordenkainen's sword, wall of force; Market Price: 125,000 gp. Source: Arms and Equipment Guide

Since Force is one of Tharizdun's domains, this is a popular item among his servants.