Acid bolt

Acid bolt, not to be confused with Acid arrow, was an exceptionally old conjuration spell used in the Underdark. Wizards from the surface saw this spell as an improved version of Melf's acid arrow, but was actually completely different.

Effects
The spell, which had a large cast range of 600', was essentially a linear stream of acidic liquid emanating from the wizard's hands. Once in contact with the target, a splash of acid would affect other targets within a 20' range, but cause less damage than that of the direct target.

Components
A specific pointed object (needle, dart, thorn or icicle) to act as the bolt, saliva from the wizard, a sphere (either glass or crystal) and a vial of acid.

History
Being an incredibly old spell, the exact origin and creator of the spell was unknown. However, it is thought to be older than the Descent of the Drow.

Appearances
Menzoberranzan video game