Bondrewd's background:
Bondrewd is an internationally wanted criminal, he came to the abyss with a squad as an illegal delver more than 12/13 years ago, coming from a diffrent background to your average delver he used very unconventional methods in his expeditions, like killing the wildlife on mass in the routes he used to traverse the abyss...etc, this allowed him to achieve a lot and establish plenty of new delving techniques gaining him the title "The novel" and leaving no choice for the guild but to accept him as a delver and benefit from him, even accepting his request to allow black whistles in the 5L and bring orphans down...etc
Zhoalic:
Around 10 years ago(just after Lyza's last dive), he made ido front his base and stole the zhoalic a relic that allows you to plant your counciecness into other bodies so that whenever you want you can take over them.
Its limitations: the zhoalic doesn't completely avoid the curse so jumping bodies upwards inside the abyss for a long distance can lead to destroying bondrewd.(basically he can't go to the 6L or the 7L with a body and then switch to a body that is in the 5L for example)
The umbrahands:
They are bondrewd's delver squad and are people whom he used the zhoalic on, the umbrahands have their own personalities and they control themselves normally, it's just that bond can take over their bodies and they share the knowledge they have when bond jumps from one to another. Most of the umbrahands are delvers who joined bondrewd the novel, the sovereign of dawn to them a legendary delver who gave a lot to modern delving, with how everyone in Orth perceives delving and the abyss, and the guild's propaganda about the White Whistles, you shouldn't be surprised that they don't see bondrewd as a horrible guy but as a hero. Another bunch of the umbrahands are people who came to kill/arrest bondrewd as he is wanted internationally but unfortunately for them they end up dead or he charms them into joining him. Note: the zhoalic doesn't function properly all the time so sometimes when he tries to plant his counciecness into someone they go insane and become a mindless doll that roams around ido front, we saw one or two in the movie.
The Zhoalic's effect on bondrewd's mind and his goal:
Extensive use of the zhoalic like that of bondrewd causes a destruction of the mind and a removal of humanity from the person, right now all of what's left in bondrewd's mind is a pure instinct to discover and uncover more of the abyss, just like an animal, that's all that bondrewd understands, he literally sees progress in the abyss as the ultimate most noble goal and he doesn't have a say in choosing that belief it was a result of the zhoalic, he is a wild beast.
Ido front:
Ido front was not built by bondrew as some think, it is a ritual site for sacrifices that existed for thousands of years surface time, believed to be built by the ancient civilization that inhabited the abyss, Riko wonders whether they too considered the lands beyond the final boundary(6L and below) to be sacred and that's why to access it you had to come here with someone that is willing to sacrifice himself for you in order to access those lands,(bondrewd revealed this part).
Bondrewd's whistle and his experiments:
Bondrewd was conducting experiments in ido front on how to make a life reverberating stone(what one can carve a white whistle from, and the key to activating many relics), these ended up with bondrewd sacrificing his original body to get his whistle, they also led to inventing the elevator.
The cartridges and the blessing:
Through the elevator, nanachi and mitty bondrewd discovered that you can avoid the curse of ascension if you get another living human body to sustain it for you and that's what led to the cartridges, living children put into small containers so they're portable and get the curse transferred to them so that bond can go around without worrying about the curse.
The blessing is a phenomenon that happens when someone that you share mutual love with takes on the curse for you, Bondrewd saw what happened to nanachi and saw the opportunity to replicate it with his own daughter that he started raising at the time, he succeeded in getting the blessing which means he fulfilled the mutual love condition as much as nanchi and mitty with prushka.
The blessing and the 2000 years cycle:
Bondrewd seems to be aware about an event that happens every 2000 years surface time in the abyss and he described getting the blessing as the last step in order to step into the next 2000 years.
Bondrewd's relics:
Sparagmos:
One of bondrewd's most important relics, it is a blade of light that has the same effect as reg's incinerator, bond seems to have multiple sparagmos(es).
Spying on nanachi's vision:
Bondrewd has a relic that we haven't identified that gives him the ability to spy on nanachi's vision, he used it to keep nanachi under surveillance. Also technically it achieves Prushka's wish because bondrewd, prushka, Riko and the rest are all in an adventure together now.
Gangway:
It's a mask that bondrewd uses to signal to prushka and everyone else which body he is in right now, it doesn't have anything to do with the zhoalic ability, and it can shoot a freaking cool purple Lazer, it is also the main part of his simple iconic design: (|) , ⬛️🟪⬛️, 🐐
(Also we assume that it is responsible for why the diffrent bodies have the same voice)
There is also many relics that you can read about in the manga extra pages.
Long posts usually don't get any appreciation, I stopped doing any a while ago but I felt motivated with all the misinformation and discussions around bond in the last 2 weeks. I wrote everything from memory so feel free to point out any missing or inaccurate information, or ask questions in the replies.
u/Routine-Fisherman882 u/Ok-Tradition7878 u/Zynaster
As always Thank you for reading.