Quote Originally Posted by Teaguethebean View Post
Well I would say that is because weird is a garbage spell.
I have never seen someone use melf's acid arrow, it is just so much worse than scorching ray or magic missile that nobody bothers.
An NPC used it once, and it happened to take one PC to 0, then gave an automatic failed death save the following round. It had a niche that caused some tension, but it doesn't seem like a great PC choice.

It's not even better than the spells you mentioned for triggering concentration checks, because it only deals damage twice, while SR / MM hit 3+ times.