So what you're saying is you want people to come up with boss-themed weapons that aren't already in the game?
Fargo's mod already has that, it's dropped from destroyer of 10% chancedestroyer staff: stardust dragon resprite but instead it's destroyer. every summon creates a new segment. every segment constantly shoots out lasers. it can also deal contact damage similarly to the stardust dragon.
a probe staff could be neat as well but not as interesting.
really? sweetFargo's mod already has that, it's dropped from destroyer of 10% chance