Dragonsbane

Dragonsbane is a deluding fluid used by Susa to weaken the Serpent at Gaia Rock in Golden Sun: The Lost Age. At first, it doesn't seem to help much against the vile creature when Susa attempts to slay it afterwards because his sword, the Cloud Brand, has no effect. However, after Felix's party battles and defeats the beast, they suggest that the Dragonsbane did cause the Serpent to be less powerful during their fight.

In the Japanese version of The Lost Age, the fluid is simply named Sake, an alcoholic beverage. This gives it consistency with the legend of Susanoo, who feeds the dragon with loads of Sake to put it in a drunken stupor so that he may slay it. The alcohol reference was removed by giving it the name Dragonsbane for the American release.