The Sky-Swallowing Azure Dragon Emperor

Reborn in another world, Xiao Chen found that he had become the weakest anaconda. Faced with the evil intentions of the whole world, he activated the Dragon Emperor's evolutionary system and embarked on a journey of devouring evolution. I thought it was just a simple upgrade to defeat monsters, but the system suddenly issued a strange mission: "Ask the host to devour itself and complete the first level of nirvana..." Xiao Chen stared at his tail and fell into deep thought - is there something seriously wrong with this system?