After the Karmic Fire Red Lotus Thousand Swords Art 'devoured' another golden-quality Skill Book, it could be upgraded by six levels. That was why Song Jian was quick to pick up the golden-quality Skill Book first.
Glancing at it, he saw that it was a Skill Book for Shield Warriors, named 'Shield Impact.' The effect was to block an attack head-on, doubling defense capabilities, and upon a successful block, it would rebound 150% of the damage inflicted back to the attacker;
This was considered a top-tier skill for those wielding shields, not just for Shield Warriors. Any class that used a shield could learn this skill.
If sold, this Skill Book would be worth at least a million Doomsday Coins;
"Devour!"
With a single thought from Song Jian, the Skill Book in his hand disappeared, and the Thousand Swords Art leveled up to six;