JKSManga
Couldn't he try the blood of the mosnter he just killed? The upper body is human soo... maybe? - It would be damn cool if he gets special mutations if he consumes enough blood of a humanoid but non-human monster. And these mutations are like skills/abilities. This scorpion monster could give him a 'Shadow Tail' that he con summon and sneak-attack people when they are distracted by his fists.
Honestly I feel like his HP increasing makes no difference to his actual health. It's like all attacks are % HP based so if he gets a whole in the stomach he won't die instantly but will lose 80% HP. If he had 5HP I feel like instead of getting insta killed he would go to 1HP. Can we please see his HP actually show some practical use? like increased defense? Maybe tougher skin? Honestly though the HP system is done stupidly you should have just given him 100HP made it permanent and then give him constitution and Vitality stats which would affect his sturdiness and healing respectively.