This is just a series of headcanons I have, both from the official novels and from different fanfics. Feel free to use them, or ask for specific prompts. I will also try to mention the original pieces that these headcanons come from. Only my second piece so plz be nice or not, your choice.

Ainz despair aura; How powerful is it?Likely at full strength it could one shot any new worlder right, except for maybe the dragons? I estimate Zesshi at around lvl 60, thus giving her an insta death.

Draws from Indolent Overlord's writings on aura(despair aura, not the elf), highly recommended.

Also from Cardinal of Sin's attack on Aura, with a different more unified Theocracy, also highly recommended.

Zesshi was having the time of her life today, she had finally been defeated! And even better it was a boy, even if he dressed weird. She would have to thank that undead for his sacrifice. The Theocracy had launched an attack on the boy while he was in the elf country, trying to prevent the elfs from gaining an ally and also finally striking at the Ainz fellow. She thought that maybe the undead would be strong enough to defeat her, but she doesn't care anymore; The elf had defeated her and she would now carry his children. Perhaps she was lucky that the cardinals had gone all in on the strike, letting them use the downfall of king and country on him while he was busy with the rest of the black scripture. After they got back to the theocracy, she would have her way even if the Cardinals refused, which she knew they wouldn't.

Cardinal POV

They had finally made the first move in their plan to deal with the accursed undead. After capturing the elf servant, they had laid a trap for it, issuing a challenge that the Overlord couldn't ignore without losing face. With the god artifacts authorised and the god kin on standby, they would finally end its unlife. Most of the Cardinals thought that the gods were guiding them, but Raymond and Maximilian were slightly more cautious. They had given Zesshi to mate with the elf, partially to create a more powerful god kin(which was contested due to the high amount of elf heritage such a child would have) and mostly because they couldn't stop her. Privately it was a distraction to keep Zesshi away from the undead, to use her as a trump card.

Nazarik POV

Ainz was angry, or more precisely, he was angry. He wasn't sure if he was glad for his emotional suppression or not. However, emotional suppressor or not, he was still frustrated, mad, and insanely vidicative. Aura's anger was not helping his mood, he could tell she was sad too, he couldn't stand making them twins fight each other. He also knew that she thought that this was her fault, seeing as she was the older sister. The other NPCs were also on edge. Needless to say a vindictive Overlord is not something good for the living.

However, because of his emotional suppressor, he was taking his time to scout out the area. But that would not take long, especially with Nazariks full force behind the mission. Aura's beast could scout out an entire city without anyone ever knowing, combined with Hanzo's and their more stealth based brothers, the scouting only took a few days. When Ainz found out about their "trap", he almost laughed as it was so shoddily put together. The cardinals probably thought that they were being clever, but he was trained by Punitto Moe, and such a basic ambush was common in Yggdrasil. It was finally time for Ainz and Nazarik to take back their Mare.

Despite the speed at which they scouted the area, it was still too slow for Ainz, and once he got the information he decided to finally make a move. He would be going there in person to draw out their attacks while different operations by Demiurge and Albedo worked in the background. It was decided in the end that he would take both Sebas and Cocytus as guards; He would not be doing anything to endanger himself like fighting. Personally he agreed for once, the scum who brainwashed his guardians twice did not deserve to fight him.

The Slane Theocracy had prepared for Ainz's famous gate spell by using one of their god artifacts that created a barrier, of course Ainz could bypass it, but he wanted them to believe everything was going to plan. As expected, when they arrived they were trapped in a magic circle with the scriptures, with their magic casters performing a ritual to do 7th tier magic. Nobody from Nazarik would allow a Supreme Being to go into danger, so it was only after a high level assassin was placed on each member of the ambush did they spring their trap. After a few minutes of Sebas distracting them, Ainz got a report on what they were planning to do with Mare; that is rape him. Hearing that, Ainz saw red.

Zesshi POV

Just before she would finally get her dearest wish, to mate with someone stronger than herself, the Cardinals came and receded the order to the user of Downfall of king and country and asked her to participate in the ambush on the Sorcerer King! She was beginning to become frustrated, but would hold off; She wanted it to be special and knew the anticipation would only make it feel better, and who knows perhaps the Undead had some other strong subordinates too. It was then that she felt it, pure unadulterated death, as the Overlord of Death and his entourage crested the hill. It was different from her aura, she could make blood lust that would reduce any warrior's fighting spirit; The thing that undead was doing felt like a physical embodiment of the void, pushing at her sanity. She could see the scriptures closest to him actually turn into dust, those further away simply dieing with any fan fare. While she knew she was stronger than any of them, with their artifacts they were still worthy opponents. That hardly mattered to the King before her now, none were worthy of his attention, he simply walked by them. Who were they to challenge him? Nature itself was dying, trees wilting, flowers falling. She now knew she had been arrogant, who was she to challenge a god? She could feel the despair increase, her grasp on her sanity slipping. Her last coherent thought was that the only way to survive was to run away. Zesshi Zetsumei of the Slane Theocracy died an uneventful death.

I assume that higher lvl despair auras also combine the effects of previous lvls, while also increasing their range. As you get closer, the higher lvl aura you experience. Kinda rushed, but I thought of this while reading the fics I mentioned at the beginning and wrote it down as fast as I could. If you have any head cannons or fics that you think I drew from, plz tell me and Ill give them credit.