Su Chen certainly did not have absolute certainty, but things had already reached this point; he had nowhere left to retreat.
Aside from allowing his daughter to refine E'rang, which would ensure her smooth breakthrough to the Half-Step Innate Chaos Realm in the future, there was another reason.
That was the fact that although E'rang was currently suppressed within the Zatian Brick, Su Chen had to worry about a potential backlash from him from time to time. If he were the least bit careless, he believed he would face a life-or-death crisis. This was the one thing Su Chen least wanted to see. Regardless of the reason, he had to completely resolve the issue of E'rang.
Chapter 1286