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From Diablo 2 Wiki

Halbu is one of the two human NPC merchants found in the Pandemonium Fortress and wears the most spectaular suit of armor that can be found in the game. Like his counterpart Jamella, he speaks very little, never offering advice or opinions on any quests. Halbu's only words are spoken, and selected from a variety of short phrases. He offers one each time a particular character approaches to trade. Ironically, considering he resides in a holy fortress, his slow, Eastern European accent makes him sound almost like a vampire.


Good to see you again.
Hail to you, champion.
Of course.
Thank you.
Welcome, avenger.
What do you need?
Your presence honors me.

Despite his near-silence, Halbu is a very useful NPC. He sells a wide variety of armor and weapons, along with bolts and arrows. He also handles the repair tasks in Act Four.