"These mean narrator or 3rd person"
' This is a thought'
The title Translates to The coming of Zhaoga meaning in my book the holder of secrets Since the MC holds the Necronomicon he is a keeper of the secret he can completely destroy the rules and fate does not hold power plus the Plot armour that is Bams body the MC, yes no Bam will die and be devoured as he can not match the insanity held within the Necronomicon bit in general Bam Also can not handle Infinity that the MC has so no Bam will not exist unless Sig allows it which is a no.
no the language in the Necronomicon will not be different from English it will just be placed in thought bubbles well he read them out though he doesn't need to as the moment he opened it his brain will process everything with Infinity's help. Infinity is not a sentient being or a being in general just something dug into his very soul by god as one of his wishes Time control will be a big use in this as Eldritch manipulate the temporal plane like its a child sandbox
Temporal Plain outlands and reality.
The Temporal plane is the plane at which time exists and why it only moves forwards the Necronomicon can allow him to change that go back in time or freeze it within a set area Probably the entire Floor if not the tower. Or just changing it so his time perception is different than others giving him foresight pretty much.
Outlands The home of eldritch entities he will not only summon skeletons Undead are quite heavily relative to eldritch so he can summon and revive things just not in the same sense as we think usually he will just extract information from corpse giving him the edge lord vibe even though he's just thinking logical No he will not be genocidal like you may think. The Outland drive all who view it insane usually, however, Shinshu sensitive beings will be able to resist this to an extent and administrators will not be effective as the giant body they use will be merely an extension of the floor core as such they are not able to be driven insane though killable easily by the thing within the book yes.
Reality is basically a barrier erected on all thing that has established a sense of normal anything that goes against that sense of normal will be seen as different or maybe even killed on the spot in the eldritch sense anything that views them is likely to go insane if viewed long enough
Fate nobody and nothing can see his fate at all he is not bound to a set fate whatsoever though they can see the path people around him can take well looking at him to figure out what relative path he will take they can not discern it. Completely. He can also create a fake path that being can view to throw them off after all Path are ever-changing no matter what 1 you take.
Reality simple the laws the tower abides by aka the principals that can not be changed such as time Fate or such it is basically a barrier made up and constructed by the disbelief of all beings that anything can go against the towers principal rules.
Unrestrained mind he is mentally able to use every single part of his brain without straining himself like an everyday person without straining himself at all so yes his brain is very much a supercomputer on steroid this also gives him a form of foresight he can see the smallest details a perk of unlocking his brain is strengthening his vision if he focuses he capable of seeing slight movement in the body he also extremely sensitive to malice project at him murderous intent Projected at him and can see the emotional aura of people thought he might not fully understand them as he restricted by his age. His body is naturally stronger than average as his brain is not restricted to 10% usage so yes even though we use 100% of our brain in a day we only use 10% at any given moment he is not prone to this causing some annoyances. Now this does not define Common sense because everybody has trouble with that
Infinity the type of infinity he got was imaginative as in the infinity is whatever energy source is used in the world/galaxy he is in he is unaffected by mental statuses such as illusion and any other form of active cognitive effects and he can translate and understand the story of everything if he looks at them long enough so translating language not that difficult speaking it another story entirely. He can also give it to other people though it is only a substantial Buff for Most there are exceptions that get the full prowess of the mark that is about it.
The book he got was the Necronomicon Or my form of it it includes everything relative to the undead and the dead along with souls some time manipulative properties and summoning incantations of the Outlanders. Such as Cuthulu The king in yellow Nyarlathotep the gate Yog-Sothoth and many more abominations he can summon tentacles and such from this book and define things hence why he has time controlling properties.