Halbu

From The Diablo 2 Wiki @ Diablowiki.Net

Act Four NPCs
Deckard Cain Halbu Hadriel Izual NPC Jamella Tyrael

Halbu is one of the two human NPC merchants found in the Pandemonium Fortress. 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 returns to town.

Hail to you, Champion.

What do you need?

Hello.

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.