With the tail being the most powerful part, the Holy Phoenix Demonic Book had a strong, overbearing power. When the long tail swayed gently, Garen could sense the horrifying urge to destroy everything locking its path. This sort of motive, or perhaps willpower, caused the Demonic Book energy which flowed in the long tail to rotate according to a mysterious track, which then produced a stronger power.
"It's like… It's still cultivating!" Garen suddenly understood the principle, a sense of absurdity arose within his mind.
A part of his body was actually cultivating a constantly powerful force according to his independent Willpower.
He tried maneuvering this kind of power, and it could actually be used regardless of each other.
"If so, with the tail added, there are still two other places. Together with myself, isn't that equivalent to having four individuals practicing and strengthening one body at the same time?!" He was surprised and happy.