Gorgon Blood

Gorgon Blood is a spoil of war left behind after killing a Gorgon. According to Stheno, blood from the right side of a Gorgon's body can heal someone, while blood from the left side of a Gorgon's body is fatal.

The Son of Neptune
When Stheno and Euryale chase Percy. At one point, Stheno reveals to Percy about how Gorgon blood from their right side can cure anything, but blood from their left side can kill, depending on which side of the Gorgon's body it came from. Percy manages to escape from them long enough to get the to the Tiber River. He then uses the water to rip the Gorgons part as they couldn't reform unless connected to the earth. As their essence is washed away, Frank reaches into the river and pulls out two bottles and put them in his pocket. When Percy notices the movement, Frank gestures to him that they would speak of it later.



Later in the book, Percy decides to make a deal with Phineas. Both must drink one from the two bottles of Gorgon blood. Percy claims he can not tell either one apart. He relies on Gaea to trick Phineas into drinking the wrong bottle. Phineas disintegrates, whereas Percy only feels a stomach ache that quickly passes. The bottle of Gorgon blood did not return Percy's memory immediately; he slowly regains it throughout the rest of the adventure.