Set Spells to Stun

Sometimes you just want a prisoner. This was tricky in older editions, which killed monsters and NPCs at 0 hitpoints and didn’t have any real mechanics for the knockout. 3e changed this with subdual damage, which was non-lethal and could only render someone unconscious. But many creatures were immune to subdual and using it with most weapons carried a penalty to attack. So, in short, it was a pain to take prisoners.

4th Edition and now 5th Edition have changed this once again, with the creature that delivers the final blow determining if a creature is slain or simply knocked unconscious. So it’s actually effortless to take prisoners. But it also means you can take someone alive by hitting them with your axe, via a critical hit with the bow, or even a fireball.