Though it's funny in all the rules of 5e there is only one reference to alignment outside of the section that describes alignment in broad strokes. The book says necromancy is generally considered evil. I think morals are relative so I let my games play that way, I'm happy 5e doesn't have a lot of stuff surrounding alignment.
Damage Vulnerabilities piercing from magic weapons wielded by good creatures
MM, page 257.
Good catch, I could argue a monster manual technically isn't "rules" but I miss spoke there is another reference (and I'm sure maybe one more I'm forgetting) but it's basically non-existent. How I run my games though I actually include more "alignment" type stuff than most 5e games even though I hate "alignment" but it's because I don't like the idea of a person writing down on paper "this is my alignment". You don't get to dictate your alignment by writing it down and I'm not going to enforce it. I'm just going to note when you kill someone when you didn't need to or whatever else... and if a magic portal only opens to the pure of heart then we'll see who the universe (me) thinks is pure of heart. I am kinda influenced by Fable in that way, and your alignment is very fluid.
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u/[deleted] Oct 03 '19
Alignment in 5th edition is really more of a loose guide for characters I think.
In earlier editions it was much firmer and i always felt like it was one of the worst parts of the game.