Here are a few tips to beat the demon king:
- Buy stamina boots!!! (its important because it will help you run faster from the demon king if he is about to explode).
- Buy lv 5 armor in big quantities because you will die ALOT.
- The explosion is about 50 blocks wide.
- If he just exploded press Y to get his attention so he will suck you in and then you go in for a swing.
- Have a few lv 5 demon smiters
- And talk to the Humoids and Neanders leaders they’ll give you some useful stuff!!!
Also don’t forget once you hit the demon king he will teleport away about 150 blocks away and if your using a lv 5 demon smiter its will take 6 hits to beat him!!!