Ambrosia - is used as healing food to be used when someone gets injured in battle. Demigods can consume it, but if they have too much it can make them feverish and mortals cannot eat it at all without it, "turning their blood to fire and bones to sand". It takes the taste of the user's favorite foods.  Comes in squares.

Celestial Bronze - is a powerful metal wielded by the gods and their demigod children. Celestial bronze is mined by the Cyclopes from Mount Olympus. The ore is shaped by tempering the metal in Mount Etna and cooling it in the River Lethe. The metal is deadly to creatures of the magical world. Unlike mortals, demigods are also affected by it because of their blood. Artifacts of celestial bronze are known to emit a faint bronze glow. The metal is able to disperse monsters into dust once a weapon made of Celestial bronze passes through them.  Then monsters transfer into Tartarus.

Golden drachmas - are large, round coins that are usually made of gold or silver. They were was used as currency by the Ancient Greeks. Mortals used to use the silver drachmas. However, as Chiron stated in The Lightning Thief, the gods never use anything less than pure gold. The drachmas have images of various gods stamped on one side, and the Empire State Building on the other. Golden drachmas are used as currency, to send Iris message, and for getting a taxi ride from the Gray Sisters.

Ichor - it is the ethereal fluid that is the Greek gods' blood, sometimes said to retain the qualities of the immortal's food and drink, ambrosia or nectar. It was considered to be golden in color, as well as lethally toxic to mortals.

Nectar - is used as a healing drink when someone is injured. Demigods can drink it, but if they have too much of it, they are in danger of being incinerated. Humans can't drink it at all without being incinerated. It has been implied that nectar tastes like anything the drinker likes (favorite food or drink).

Stygian Iron - like Celestial Bronze and Imperial Gold, is a magical metal capable of absorbing or destroying the very essence of monsters and injuring gods, titans, demigods, and giants. Unlike Imperial Gold and Celestial Bronze, it can harm both mortals and immortals alike. When seen, it is shown to scare monsters even more than the other two metals. Possibly because the essence is absorbed into the blade, which prevents the monster from going back into Tartarus to reform. It also appears to have a significant effect on ghosts and creatures from the Underworld. Stygian Iron is mined and forged in the Underworld and cooled in the River Styx, producing a clean indestructible blade. Because it is cooled in the River Styx, it is believed that only deities from the Underworld and their demigod children can use it, but other powerful beings have been known to use Stygian Iron.