That book was a grimoire left behind by a real eccentric. Whoever opens it is afflicted with a curse that consumes their life.

Of course, even just opening it takes the correct spells and magical might, but...

I didn't think that girl could actually do it.

I'm surprised... or rather, she must've really worked hard on it.

It's impossible to dispel.

The curse gnaws through your body in about two hours. No method is fast enough.