Can a grimoire lose its power over time? - Who posted?

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Eternal Idol 5
Wanderer 4
Moonlit Hermit 3
Red30 3
stupidmonkeyboy 3
talerman 3
corvidus 2
fratersd 2
NoxLumina 2
Pablo 2
Amxha 1
blindwake 1
Brother_Moloch_969 1
Diazin 1
MagiAwen 1
Magister C 1
Rova 1