User blog comment:Hermione Chase/"The Blood of Olympus" Expectations/@comment-25229155-20140809182103/@comment-3146930-20140810173738

Three is considered a sacred number and is the best number for a quest because too many demigods would draw in too many monsters. In The Battle of the Labyrinth, Annabeth picks three other people to go on the quest (four if Rachel is counted), yet all of them made it back alive by the end. If you really want to go by the rule of three, there are seven demigods so two teams of three with one extra, meaning only one may die.