I created the BFG - 9000 in minecraft. Nice.
Once downloaded, type /function bfg:givebfg to give yourself the BFG, and then go ham.
The BFG projectile will:
-Inflict all mobs within 25 blocks with instant damage 2 (or instant health for undead)
-Inflict all players within 25 blocks with instant damage 1 (except the one who shot the BFG)
-Kill all items, arrows, and blow up end crystals within 15 blocks
-Explode automatically after traveling for longer than 5 seconds

Should be multiplayer compatible, but please tell me if anything goes wrong because I haven't done much testing with it.
Requires an operator to summon the BFG, but non-operators should be able to use and be affected by it.
Higher levels of Quick Charge can be added without consequence, but Piercing and Multishot will have no effect. Unbreaking and Mending are irrelevant because the weapon does not lose durability.

This is my first post here, so hopefully its not trash

Known bugs:
-Rapid height or rotational change while firing will cause the projectile to get stuck in midair (falling, flying upwards, doing 360s)
-Boss mobs are unaffected (ender dragon, wither)