Leon was quite seriously injured. Just to restore his ability of movement, he needed a full four to five days of cultivation.
The injuries on his body were not serious. It was merely the shattering of his internal organs due to impact when a magical anti-phasing of his spell occurred. Such injuries could almost be fatal to ordinary people, but to him, this was nothing. Leon was a master at the legendary peak. For those who had reached this level, their bodies would have undergone a certain degree of sanctification. This would mean that even if there were missing arms or broken legs, they could grow back or repair these limbs again, much less a mere internal injury. For Leon, the true cause of such a serious injury was the impact of the shock dealt to his soul. It was an extremely violent concussion.