Jiang Yi's overall combat strength was very powerful and could even kill a middle-stage Heaven Monarch, but he had to rely on the Thunder Fire. Without the Thunder Fire, he would have to die if he didn't use the Heaven Evasion to escape.
His true cultivation realm had always been rather weak. His dao pattern realm had reached the Heaven Monarch Realm, but the combat strength was definitely not strong enough. He had only comprehended some low-grade dao patterns and one mid-grade dao pattern. He had yet to fuse that high-grade dao pattern and didn't know the power of it.
His essence force cultivation was even lower as he was originally only at the fifth stage of the Vajra Realm. Right now, with the cultivation speed at 1000 folds, it was already considered heaven-defying for him to reach the peak stage of the Vajra Realm in three months.