The Dark Warrior picks up one week from where The Undead King left off. With almost no knowledge of this strange new world, Ainz sets off for intelligence gathering. Donning a dark suit of armor and the name Momon, he poses as an adventurer to learn the lay of the land. This premise shows that Ainz is clever enough to be cautious. His battles in the previous book leave the impression he is nigh invincible in this new world. But he does not know that for sure and does not assume it. Ainz wants to take things slowly and find sure footing, as opposed to immediately becoming overconfident.
Ainz’s plans for the future stick out in other ways as well. The currency in the new world is different from the money he has stockpiled, which has two effects. One, he cannot spend most of their money without giving away that he is a “foreigner”. Two, he has no idea if the new money will work to create items, cast magic spells, etc. Despite being in a real world, video game rules do apply to Ainz’s new life. Not necessarily all of the same rules he is used to though, hence his extreme caution.
Besides Ainz, we do get some other good character development in this book. One of the Pleiades (battle maids), Narberal, accompanies him disguised as an adventurer so we get to flesh her out. A slew of new characters come in as well; a group of adventurers, their client, and a villain. The Swords of Darkness adventurers are a happy, campy group of well-rounded, typical adventurers. They gave a good feel for what most adventurers in this world are probably like. In the story they take a job for Nfirea, a talented young potion maker. He was a smart character who was put together well; hopefully we see more of him in the future. Lastly was the villainess Clementine; man, she was a cold-hearted snake. A nasty, nasty lady who is probably as evil as some of the literal monsters Ainz hangs out with.
The Undead King seemed more about world building while The Dark Warrior seemed more focused on characters. Notably, there were some differences from the television show in here as well. While the episodes that covered The Undead King did not leave much out, a lot of scenes from The Dark Warrior were either cut short or omitted completely from the show. It made the story much easier to follow in the book, which will make me happy to keep reading Overlord!