In the Dark Hunter series we find in "Acheron", in the epilogue pg. 718, when discussing the groomsmen, it says that
Kim was with Vane, Geary was with her husband Airk, Katra with her husband Sin, Danger with Alexion-both of whom were in temporary human bodies. Simi was with Zarek, Justina with Kyrian, Katherina with Styxx and Aimee was there with Dev.
Assuming that the dates actually work out, why would Styxx be at the wedding when Acheron hates Styxx at that time? They are still enemies after Styxx sent Sebastos a gift on May 14th 2012. They only make up after Acheron spoke to Urian on June 25th 2012. This is years after the wedding takes place. So why is Styxx there?