This is the Wild Mass Guessing page for Kevin Hearne's Iron Druid Chronicles series. Feel free to go so nuts with it that Loki thinks you're insane. Spoilers abound!
How better to gather her forces and help with the final attack on Ragnarok as a surprise than by completely faking her death? And as Atticus was closer to her than anyone else, convincing him would likely convince everyone else.
Goibniu even mentioned that Scathach was moving in - who, in lore, was the very dangerous woman who trained Ireland's greatest hero. Nobody'll mess with her if they think she's taken up residence in the fen. And what better bodyguard could you have while you're hiding and marshaling your magic and plans than the only woman to beat the best warrior in their history and taught him all he knew? Ergo - the Morrigan, a badass in battle in her own right, is alive.
- In Shattered, it is revealed that even though several gods have died so far most if not all of them wont stay dead. Due to the power of belief the gods who still have some worship/relevance in the modern world can remanifest themselves.
- Shattered also involves a scene where the characters commune with the spirits of the dead on Samhain. Midhir appears immediately when summoned as a smokey outline and converses with all present. The Morrigan on the other hand pops up suddenly next to Atticus, not having been summoned, appearing fully solid and even touching his chin, all conveniently while the other character's backs are all turned, and speaking to him telepathically so they cannot hear.
Nobody wants anything to happen to that pooch, but he's lived exponentially longer than any other wolfhound that exists. And if you want real pathos, a real kick to the gut, the enemy won't kill his lover. They'll kill the unequipped, vulnerable dog that he's had as a best friend for far longer than he should have. It's not pretty, but it's war, and wrenching the heart out of Atticus would be a valid strategy on the bad guys' part. This is a WMG that I'm seriously hoping I'm wrong on.:Not exponentially. They've "only" been together for 30-something years, which is 5 or 6 times a wolfhound's normal lifespan.
- If it doesn't work while you're dead, that would explain why he came back as such a different god.
Bar Zhang Guo Lao, the entire Thor Revenge Squad's experiences with him can be explicitly dated to after or during the Christianisation of Europe, including/especially the homelands of Thor's traditional worshippers. Leif is about 1000 years old, when Scandinavia had been in the process of being Christianised for 200 years. Väinämöinen explicitly refers to his people turning Christian when he packed up and left, and the tipping point was around the 13th or 14th century. Perun referred to the composition of the Eddas when Thor tricked him, which is dated to around the 13th century. And Zhang Guo Lao can be inferred to be around the same time or after, as he and Thor communicated in Russian - the Kievan Rus', the official founders of Russia, were led by a Varangian warrior class of pagan Scandinavians until their official conversion in 988 under Vladimir the Great. Given that Russian was a distinct language that they shared (to an extent), they probably encountered each other either during the time of the Grand Duchy of Moscow, a vassal state of the Mongols and later the Golden Horde, putting the meeting between the 13th and 16th centuries. Gunnar, meanwhile, explicitly dates back to the 18th century.
During this time, Thor was being both promoted as a heroic defender of humanity in myths and folklore, such as the Eddas, but also being demonised by the Churches, and especially demonised given his prominent position, something that went on for over a thousand years. So, there were mixed images of him as an unmitigated Jerkass and possible demon, but also a hero and protector of humanity. The result? Jerk with a Heart of Gold, albeit one where the 'heart of gold' is borderline invisible. Once he dies, he loses all that mixed up belief baggage, and is a much more pleasant person as a result, explicitly thanking Atticus for helping to kill his previous incarnation.