That book was a grimoire left behind by a real eccentric.
Whoever opens it is afflicted with a curse that consumes their life.
"I see."
The curse gnaws through your body in about two hours.
No method is fast enough.I didn't think that girl could actually do it.I'm surprised... or rather, she must've really worked hard on it.
*tap*
Of course, even just opening it takes the correct spells and magical might, but...