Life Reset by Shemer Kuznits
New Era Online, Book 1
After being betrayed and cursed by an extremely rare spell, Oren, a powerful and influential player, finds himself as a first-level goblin!
Without even a fraction of his previous power, he vows to pull through and have revenge on those who betrayed him.
His thorough knowledge of the game's world and his unique ability to immerse himself entirely are his only advantages. But first, he must figure out how to survive long enough playing what is basically a low-level fodder monster!