The [eldritch arm] transforms the arm, makes sense right? plus whole body is too OP and breaks plot things/world building. Gradual power up is more entertaining... I think. Thanks for Reading!

Oh those were items or products in the [Shop]. He was just browsing through the [Shop] and I gave several examples. David then bought other items mainly the [Eldritch arm] etc. I think its quite clear in the story. Hopefully this clears your doubts.

The [L1-strain] only gives abilities to those immune to its negative zombie turning effects. If anything its the original [L-strain] that David wants. Its a bit complicated but I will explain whats happening and his decisions in later chapters.

when i mentioned night vision or other utility type abilities it was more to highlight the fact that David could or perhaps 'should' focus on more 'vital' abilities. In the end whether he deems to really buy those abilities is on David. I'll check it out anyways. Idk if I actually mentioned he would really seriously buy something like nightvision. [Spirit Channeling] would help with vision and other senses which is why I introduced it.

I'm not clear on what you mean by 'summons haven't been used yet'. I mean he does use the [Eldritch arm] pretty much all the time and the [spirit animal] is also used. Did I write a summon and forget?? I'm not sure lol . Thanks for reading!

there is patriotism and then there is this weird xenophobic and pretty offensive racist shit. there are other occasions where Chinese authors are patriotic and its okay, its tolerable/somewhat reasonable but damn oh damn some Chinese authors go overboard aka this one. read b4 on gravity tales. so unbearable they stopped the translation