Slight issue here as noted before. A lot of the game is about balance and most of the time, whites are balanced. Different whites have different strengths but there is no single white that is “directly superior” to others. Your version of the doom bow is quite broken. I know that you didn’t make it this way on purpose because when you were making this bow, you were only thinking about the classic doom bow and therefore this bow made logical sense. However, when designing an item, you can’t only look at one item before it and base all of your knowledge off that one weapon.
Sure this is an upgrade from a doom bow, and that makes sense because doom bow drops from a weaker version of this dungeon. HOWEVER, doom bow is largely considered a very balanced bow, even compared to bows that drop from more difficult dungeons such as void bow, leaf bow, and coral bow. Although your doom bow is understandably better then the doom bow, it is also better then these other bows and therefore is not balanced. Therefore, if you would like to make a “ancient doom bow”, stop basing it around a bow that already exists. Make something unique, something fun, not an overpowered mess.
Shots hit multiple targets
