Book that can alter arrows fired by the player. Datapack can be put onto you world by simply dropping the .zip file into your datapack folder.
Obtain by doing /function bowbookns:givebook
Can be crafted in survival by dropping a book and quill, bow, nether star, and end crystal onto an enchanting table.

List of alterations:

Fire: Makes you shoot fireballs instead of arrows
Lightning: Lightning strikes on arrows after they land
Explosive: Arrows explode after they land
Death: Gives off a harming aura after landing
Life: Gives off a health aura after landing
Web: Spawns a web upon landing
Hellfire: Rains fire down from above
Fancy: Gives arrows a green particle trail
Ender: Teleports user to arrow after landing

Also has a button to kill all arrows and a toggle to do so automatically after landing.

I recommend AutoKilling arrows, as it can get quite crazy if you don't.