Staff of Rynn

Staff of Rhyn is an enchanted quarter staff +4. This staff has a +4 bonus to damage, -4 THACo bonus and speed factor of 1. This item appears in Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition. It can be bought from the Adventurer's Mart, where it's sold by Ribald Barterman.

In-game description
"Cleric's Staff + 3: This simple staff radiates a powerful enchantment, though its plain design suggests a simple origin. It reflects the quiet strength that faith brings, and was likely the modest weapon of a priest or cleric."