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S1-10.ITM is an undroppable melee weapon used by various creatures.

It is considered a non-magical, non-enchanted weapon, and deals 1d10 (slashing) damage (adjusted by Strength bonus Shadows of Amn LOADCNTR00004 Icon SoABaldur's Gate II:
Shadows of Amn
This icon indicates content from the original Baldur's Gate II: Shadows of Amn campaign.
), with a range of one foot, and speed factor of 0.

It has no other effects.