Halcyon's Mansion was the home and prison of Greek demigod Halcyon Green and was seen in The Demigod Diaries. It was used as a trap to punish Hal for revealing the future to a girl who was supposed to die, luring unsuspecting demigods to their deaths.
Appearance[]
The structure itself is two floors. The door is heavily enchanted and the drapes are deadly sludge that creeps up anything that touches it.
The Heroes of Olympus[]
Halcyon Green, who owned the mansion up until his death.
The Demigod Diaries[]
The Diary of Luke Castellan[]
Thalia Grace and Luke Castellan discover the mansion while being lead there by Amaltheia. They spent the day trapped and trying to escape until Halcyon Green sacrifices himself to distract the Leucrotae and let the young demigods escape.