The Order of the Stick book 6. Serious spoilers for earlier works ahead, as this one makes little sense without them.
Starting with its opening with Durkon as a vampire, which means that a vampire spirit is running his body and holding him prisoner in his own head.
This leads to a lot of incidents of his memories. Meanwhile the quest to save the world goes on with some sidequests and subplots. Belkar's awareness that Durkon is not really Durkon. A thread for Halley's past gets tied off and shows her growth. A fight with giants that goes reasonably smoothly except for drama on the ship. The discovery that the gods are discussing what to do -- it really has reached such a pitch that can be a subplot. Death. A steampunk gnome city. And more.