Ichor

Ichor is the golden blood of Gods, Titans and other immortals. It is shown to flow from their bodies when harmed by the right materials.

Description
Ichor originates in Greek mythology, depicted as the blood from the Greek gods. Golden in color and fluid in form, is considered a sacred liquid but harmful to mortals. Gods, demigods and other divine beings were depicted as bleeding Ichor when harmed by specific materials.

The Lightning Thief
Ares bleeds Ichor when wounded by Percy Jackson.