Blade ward in 2024 now subtrack from attack roll instead of grant resistance for physical damage

now i have a question, it effect only one attack and the spell is dispel(like Guidance that effect only one roll) or effect all attack until the spell end?

Whenever a creature makes an attack roll against you before the spell ends, the attacker subtracts 1d4 from the attack roll

Jurmondur is correct; it affects all attacks against you for 1 minute (unless you lose concentration on the spell). It's also worth pointing out that the 2024 version of Guidance doesn't work that way anymore either; it also lasts for 1 minute and affects all relevant rolls during that time, not just one.

And this is just a cantrip?? This is OP for a cantrip. It's like a save throw-free Bane if all you need is to protect 1 person. Holy moly.

Quote from Song_of_Blues >>

And this is just a cantrip?? This is OP for a cantrip. It's like a save throw-free Bane if all you need is to protect 1 person. Holy moly.

The tradeoff for it being a cantrip is that (unlike something like Bane) you can only use it to protect yourself, and it only works on attack rolls. It also doesn't scale with your level at all the way a lot of cantrips do.

If you know you're about to get into a fight and can cast it beforehand, it's great. I'm not sure it's worth spending an action on during combat in most cases.

I see. Range of Self. I guess that is pretty serious limiting factor. Dang, Moon Druids should totally be casting this. Oh wait...