"The sage affirmed that I'm an Undead and my inherent incompatibility with all creatures cause the experience points to increase abnormally. But..."
Adam slowed down his pace and walked to the nearby tree. Leaning his back onto it, he said to himself, "Might that be applicable to magic too?"
His evaluation was pretty otherworldy but it was logical and made sense with adequate explanation.
Let me help you.
Adam, a person who was brought back to life from death, is undoubtedly Undead. He exists beyond the bounds of the natural order. An abomination, in other words.
Though he may act and live like a mortal, the very nature of his existence clashes with the natural order. It's no wonder how he's a bullseye for almost all beasts.
Therefore, the reason behind the unforeseen rise in XP is substantiated.
But what is it's the same scenario in this case?