So that sums it up, essentially four gold coins per life.
According to Duan Kecheng's explanation, this is also a kind of indirect method of reincarnation through dissolution, right? Although it's still quite crappy...
Of course, demons' grimoires never lack offensive and supportive magic, which can all be acquired in this manner; one could buy their own grimoire and spend money to have demons provide support.
However, world 0791 is ultimately on the science side, and before 'Shattering the Heavenly Dao', the effects that magic from dukes and counts of demons could provide are limited, not very cost-effective. It's still more economical to go for RPG explosions. So, getting one "Resurrection Book" to test its effects would suffice; there's no need for more.
