Demigods are Possessed and Quests are Served

Not long after the war with Gaea, another prophecy arrived at Camp Half-blood. It told of a person from the past and a threat that would destroy Camp and beyond. The demigods were thrown into the fray of battle once more but this time, they had one of Araluen's best rangers on their side.
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A crossover between Percy Jackson and The Ranger's Apprentice, (with debatable accuracy to Greek Mythology and canon).