"Abyss Intimidation, Abyss Intimidation!"
Song Jian kept muttering in his heart. Would it be worth it to spend three to four days advancing such a powerful skill? Of course, it would be. If Song Jian had enough battle experience now, he would have chosen to advance without a second thought. But he had just leveled up, and his battle experience was far from reaching ten million, not even a hundred thousand. He wanted to advance this skill but just couldn't.
"If the Abyss Temptation can be advanced, what about the other skills?" A brilliant idea flashed across Song Jian's mind, he turned his attention to the other skills in the Book of the Abyss.
Unfortunately, no matter which skill icon he clicked on, he received a system prompt saying, "The conditions for advancing this skill have not been met. Cannot advance."
