References
Spartoi-Skeleton warriors that are formed when an eurynomos finishes a meal (yum, can you guess what it is?). They can be summoned and tamed by dipping blood onto dragon teeth. They are particularly attracted to rocks
Oneiroi-Violent daimons of nightmares, particularly violent ones. They often lift you up and drop you while you are sleeping, which is why you sometimes suddenly wake up and feel as if you dropped to the ground
Melinoe-The goddess of ghosts. She haunts the mortal world every night, but stays in the Underworld everyday. Percy, Nico and Thalia fought her in the Demigod Diaries
The Gates of Horn and Ivory-Two sets of gates that represent truth and lies. The Gate of Horn is truth, while Ivory is false. If you understand Ancient Greek, then you'd realize it is a play on words, as Truth and Horn sound alike and Lies and Ivory sound alike. So yeah, ancient Greek humor. Can you even imagine?
