The story begins with Yggdrasil, a popular online game which is quietly shut down one day; however, the protagonist Momonga decides to not log out. Momonga then becomes trapped in an alternate world as his in game character, a powerful skeletal wizard, along with his entire guild base and customized non-player characters (NPCs). This new world continues to change, with non-player characters (NPCs) beginning to feel emotions and Ainz adjusting to the limitations of his class. Having no living parents, friends, or place in society, this ordinary businessman Momonga then strives to become known in the new world he has entered in order to respect what he and his former guildmates built together.
Power of the verse
The power of the characters has not been revealed too much, but the characters that have shown their power have rather hax abilities, to the extent of abilities like Black Hole Manipulation, Death Manipulation, Resurrection, etc.
There are also the World Class items, and while their effects are mostly unknown, some of them have extremely powerful hax abilities, like the Longinus, capable of completely removing the target from existance at the cost of the user's own existence, and another item that is capable of changing the fundamental laws of magic.
In terms of AP and Durability, the fodder characters are usually in the Multi City-Block range, while the top tiers are Island level. However, the series is lacking in speed feats, so even the strongest characters are only Supersonic, as of now.
Pleiades "Six Stars" Battle Maids: