
The way Ainz views the NPCs has changed, initially afraid of them, he now feels a sense of duty, like a father to his children. (Not that I condone or support his evil actions)
I will explain this in more depth, because if we understand what happens in Volumes 13 and 14, there is a very fundamental shift in motivation for Ainz's character. he is no longer haunted by the fear of betrayal or rebellion from the NPCs. His leadership dynamics are now based on pragmatism, results, and a sense of responsibility, rather than just a survival effort against his own subordinates.
For example, the reason he completely entrusts various operations to Demiurge is not out of resignation or laziness, but because Demiurge is the most genius entity in Nazarick whose track record has never once disappointed or harmed the guild. As long as that plan proves capable of strengthening Nazarick, Ainz will go along with it without caring about the impact on the outside world.
However, on the other hand, he also once firmly rejected Albedo and Cocytus proposal a Level 100 NPC who is physically much stronger in combat than Demiurge. This serves as clear proof that Ainz maintains rational control as a leader; no matter how strong, loyal, or influential a subordinate is, if their plan does not provide a clear benefit to Nazarick, Ainz will not hesitate to reject it.
The root of Ainz's communication deadlock and the reason why he continues to choose to pretend is not merely ego or ordinary character weakness, but the trauma of his attempt to be honest, which ended up being painful. During the events of Volume 13, Ainz once tried to break down the wall of his own perfection by bowing his head and sincerely apologizing for his limitations and iignorance.
However, this honesty backfired. Instead of gaining understanding or relief, his action instantly triggered panic, guilt, and profound sadness in Albedo, Demiurge, and Lupusregina. In the absolute view of the NPCs, a supreme entity cannot make mistakes, if Ainz is sad and apologizing, they assume that their own inadequacy is what failed and burdened their master. This reaction struck Ainz's inner self hard. He felt intensely guilty that his good intentions to be honest and open instead caused immense emotional burden and made his "children" suffer.
From that bitter experience, entering Volume 14, we see a tragic resolution to Ainz's character. He is now fully aware that the NPCs will never leave him or betray him, no matter what happens. His past fears have evaporated, replaced by one absolute new goal, to protect the smiles and happiness of the NPCs left behind by his friends. Their relationship has now completely transitioned into a bond akin to that of a father and child. Ainz knows full well that his children will feel deeply happy, proud, and whole just by receiving praise from their father.
Therefore, Ainz decides to accept his fate. He no longer wears the mask of the Supreme Being out of compulsion or fear, but rather as the highest form of dedication from a father who is willing to shoulder the burden of a lie for the rest of his life just to maintain his family's happiness.
This is where Ainz's apathy plays a crucial role. For Ainz, spreading immense suffering or even committing genocide against millions of lives in the New World means nothing at all if those actions can ensure the security of Nazarick and preserve the smiles of the NPCs. His paranoia has not disappeared, but it has now completely shifted from internal threats to extreme vigilance against external dangers that might dare to harm his organization.
Ultimately, this explains why the author, Kugane Maruyama, views Ainz's fate as "pitiful." The greatest tragedy in the story of Overlord is the slow yet sure loss of Suzuki Satoru's humanity. He consciously chooses to "kill" his fragile human side, burying his true identity deep down in order to fully play the role of Ainz Ooal Gown, the perfect and merciless tyrant.
This is the ultimate irony of a sacrifice, a dark tale about a father who is willing to imprison himself in eternal loneliness and sacrifice his inner relief, solely so his children can continue to live in the illusion of perfection and keep smiling happily under his protection.
Honestly, I hate the anime adaptation because it has missed many things that make Ainz so complex as a character. The anime cuts out too much of Ainz's internal monologue.
This why, I like Overlord.