Di Ku's master was a peak-level powerhouse in the Immortal Great Freedom Realm. He was killed by a traitor, but before he died, he transformed his life's cultivation into nine Dao Fruits and sealed them in Di Ku's sea of consciousness. Once Di Ku finds a Dao Fruit avatar, he can unlock one of the fruits and inherit one-ninth of his master's power. When all the fruits are unlocked, he will inherit his master's full strength and be able to avenge him... eventually becoming the Lord of the Universe.
