Wow. With that terrifying description it completely explains why he's so laid back all the time. And then you remember that she's only seeing the current him with one seal broken.
It also makes you wonder just what kind of entity was even able to seal him in the first place.
the seals are his own work, basically to make others in the known feel more secure. But its completely trivial for him to remove the "seals", so if things go south he can go as far as he considers needed
Thank you for the chapter! After all we have seen him do that description was perfect. No “oh maybe if I“ just complete terror at seeing something so far beyond anything you could have imagined. Damn near lovecraftian but with a pretty standard isekai protag face lol