Baldur's Gate Wiki

UMBER01 is an undroppable melee weapon used by various Umber Hulk and Myconid creatures.

It is considered a magical and +3 enchanted item and deals 3d4 (crushing) damage (adjusted by Strength modifier), with a range of one foot, and speed factor of 1.

This item provides immunity to the status effect Confusion, as well as the animation played over the target. Any creature with this item as its quick slot melee weapon will be immune to those effects.

There is an UMBER02 melee weapon in the unmodified game as well, which is nearly identical. It inflicts 3d6 (crushing) damage. These are assigned to some, but not all, Umber Hulk Elder creatures in the game.