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"If we were to try, your soul would be destroyed in the process."
"Your soul and the curse have become one combined mass; it is part of you."
"The Grimoire, however, has already been modified by us without you realizing."
"What?!" I asked.
"Just now, we combined our strength and refined the Grimoire you hold, overpowering the might of Lucifer's will over it. Now, you're free of his watchful eyes, and the Grimoire might now develop several new functions that will help you in your adventure from now on."
The biggest of the twelve spirits spoke with a wise old man's voice.
"You did… such a thing? Well… thanks."
"There is no need to thank us, we've merely given you back some of the favors you've done to us."
"Favors?"
"Planting those trees has helped greatly to our world. And now that you've set into a mission to plant more, you will be helping greatly."