* EsotericHappyEnding: [[spoiler:Both Jack and Thorgil die (but fortunately, they're taken to the Islands of the Blessed to become bards). Their families are left to mourn.]]
* UnfortunateImplications: Full-fledged Christians are, at best, good but slightly stupid. Only pagans (or pagan/Christians, like Jack), are truly good.
** Hobgoblins are an exception, though (yes, there are ''Christian hobgoblins'').
** In book 3, the heroes meet a shady, treacherous dwarf (not the [[OurDwarvesAreAllTheSame mythological kind]], but a "little person"), who only turns good after HeelFaceBrainwashing.
* WhatDoYouMeanItsForKids: Despite the violence, death, and disturbing imagery throughout the series, it's ostensibly written for young adolescents.