In Song Jian's hand, the Book of the Abyss is actually a complete skill tree with nine levels. The first level has only two skills - one is "Abyssal Demon Armor," and the other is "Abyss Temptation."
The Abyssal Demon Armor is formed by using the fourth-tier Abyssal Raging Flame to condense a full body armor on the surface of the body. However, this armor only enhances resistance and does not provide defense power. Song Jian would only summon this armor when facing Abyssal creatures.
The other skill, "Abyss Temptation," not only has an extremely long casting time but can only be used when the target is immobilized or even severely injured and loses the ability to resist. Another drawback is that the longer the effect lasts, the higher the chance that the enchanted creature will betray. After trying it a few times, Song Jian never used it again.