Blackblood is a unique Club +3 in Baldur's Gate II: Shadows of Amn, which has the normal bonus of +3 to damage and THAC0, but also deals +3 acid damage every time it hits the target, which makes it an excellent weapon for druids to slay trolls. However - unlike a normal enchanted club - it has no bonus to speed factor, nor does it have the reduced weight of a typical +3.
Blackblood is sold in Trademeet by an unnamed merchant after the genie problem has been solved.
Description[]
“ | This oak club is coated with darkened dried globs of a tar-like substance. During battle this substance glows black with an inner light, and becomes thick and fluid. When the club strikes an opponent it delivers additional acid damage from the liquid splashing over the victim. | ” |