Sesmu is the deity of wine and this substance in Egyptian myth, while Christian figures associated with it include Zagam, who can change blood into it, and Ukoback, a demon of it charged with keeping hell's cauldrons full.
In Chilean mythology, throwing the Trauco's staff in a fire will cause it to produce this substance which can be used to heal people who were hurt by the Trauco's curses.  Some of it prevents Osawa's duck messenger from reaching the Earth, while a namesake man of Thai mythology covers himself in this substance before going out to rape women and boys.  Sesmu is the deity of wine and this substance in Egyptian myth, while Christian figures associated with it include Zagam, who can change blood into it, and Ukoback, a demon of it charged with keeping hell's cauldrons full. A drop of it awakened Eros when spilled by Psyche from the lamp she was using to view his face. FTP, name this substance, which helps to name the grove on the Mount of Olives where Jesus hung out before his crucifixion, Gethsemane.
In Chilean mythology, throwing the Trauco's staff in a fire will cause it to produce this substance which can be used to heal people who were hurt by the Trauco's curses.  
oil ["Gethsemane" means "oil press"]