Something that I find bothersome in D&D is that if a creature is prone within 5 feet of you, and you are holding a gun/bow, you still get a disadvantage on the shot, which doesn’t make much sense. You are shooting a sitting duck.
So I made the killshot spell to fix that, and to fix characters going in and out of the gates of death with no consequences.
On the other hand, paladins and rangers are the wardens of my Cowboys from Hell setting (of most settings to be fair), as such they get abilities to hone their reflexes and take down them bandits
Evan | MonkeyDM
P.S: You can find far more of these spells from Cowboys From Hell, all 70 pages available on my Patreon
(Dungeons & Dragons 5e Spell)