Tang Yin only spent 3 weeks mastering Soul Dart. He had to admit that its speed was terrifying. Even a Peak-stage Principle Comprehension Realm cultivator would find it difficult to notice the Soul Dart incoming. It would be too late once they detected the Soul Dart.
Now Tang Yin had 2 soul-type Martial Skills to attack with. However, this was not enough for him, he wanted to learn more. He also had hundreds of different soul-type Martial Skills to choose from.
After careful consideration, Tang Yin decided to choose a defensive soul-type Martial Skill.
It was a Tier 2 Martial Skill named Soul Sanctuary.
The Soul Sanctuary Martial Skill created a pure barrier of Soul Energy around the Soul Sea.
The Soul Sanctuary could defend against foreign divine senses, divination and any soul attacks. It functioned depending on the power of the user's soul.