Paul left his training chamber for the first time in 3 weeks.
Coming out, his brown eyes were blood-shot and covered in veins, signs of his extreme exhaustion and how much he exerted himself to gain preliminary mastery over his first battle technique.
The battle technique, Viper's Sting was extremely demanding.
Only when learning it did Paul confirm its label as an impractical battle technique. Without the healing God power or a powerful healing God artifact, it was literally impossible to master this battle technique.
Like it's description in the book, it was a 2-edged battle technique for assassination or a high-offensive battle style that offered insanely high offensive power with extreme drawbacks.
Thinking of the training he just went through for the past 3 weeks, specifically the torture, Paul's eyes turned cold.