Goblin Slayer's Take on grimoire
What follows about grimoire is a goblin's account, which means most of it is accurate, some of it is invented, and the parts that matter most are stolen from someone else.
Goblin theorists have organized at least four schools of thought on grimoire, and one of those schools exists only to disagree with the other three. This is considered, in goblin terms, a healthy intellectual ecosystem.
Goblin Periphery: content
In the goblin underground, content is approached the way one approaches an unfamiliar lock: slowly, with curiosity, and with several backup plans for when the obvious approach doesn't work. Goblins are surprisingly patient about this. They have, after all, the time.
liturgy: Goblin Fragmentary Material
Goblin sleep researchers note that liturgy appears in dreams reported by their study participants at a frequency that cannot easily be explained, and which they are, for the moment, declining to explain at all.
The Goblin Verdict on grimoire
After extensive research (and several stolen artifacts), the Goblin Academy of Esoteric Knowledge has concluded that grimoire is, in fact, deeply connected to the fundamental nature of goblin reality. Whether this is good or bad depends entirely on whether you have anything the goblins might want to steal.