The Thunder Seal!
It was the most precious treasure in the Heavenly Master Sect; Yao Daoyi had kept the heretic sects in check using this artifact, due its bonus damage to evil and Yin elements. The Dark Blood race was also of the Yin element.
"Crack, crack."
Endless blue electric energy arced across the Thunder Seal. Chen Fan had been repairing the seal ever since he obtained it. The artifact had fully recovered its power by then.
"Yao Daoyi is a fool. He only knew how to summon lightning with it, but that is only a small attribute of this Dharma Treasure."
Chen Fan shook his head and started an art.
The Thunder Seal swooshed up in the air as it resonated with Chen Fan's energy. The etchings on its surface started to glow, funneling energy from the clouds into itself. Suddenly, a crack of lightning plunged down. The seal absorbed its sizzling energy and increased in size.
"Go"