PUKES BERRY You are 100% on the scale in his heart keeping him alive longer and stopping his thunder magic. I FOUND EVIDENCE Now I was just refreshing in the espisodes like the comics where there picture and episode 1 at the last panel and picture you litterly see the dragon scale and it’s definitely not the dragon mark as he gets that in episode 2 and it looks like a dragon scale that is placed on his heart exactly describing what your talking about.