If all straight lines extending from the point of origin to a location in the area of effect are blocked, that location isn’t included in the area of effect. To block a line, an obstruction must provide Total Cover.
Which to me says that in 5.5e, Cover does provide protection against a spell like Fireball unless the spell explicitly says otherwise, regardless of how it was meant to work in 5e.
I haven't read the new PHB with that much detail as I'm playing 5e myself, but I guess that would fall on the DM (like everything).
I would argue that with 5e rules you can't hide behind a rock to avoid a Fireball, but with 5.5e you can just based on that text. A Fireball is an explosion originating from a point. You might say things that are not on direct trajectory from the point of origin are not hit.
I was also curious about this change, and I made a list of other spells (probably not a complete one) with a similar update, if it's interesting to anyone:
A target with total cover can’t be targeted directly by an attack or a spell, although some spells can reach such a target by including it in an area of effect.
The intention there is that spells with AoEs may be able to go around obstructions, not through them -- the classic fireball expanding around a corner, or catching someone behind a wall by casting the ice storm to a point in space above it
If your wall of force is completely blocking the corridor, that isn't an option
I'm still curious why the 2024 Fireball doesn't spread around corners. Is it just for easier adjudication, or is there another reason? Does anyone know?
2014 didn't either in the same way. The area of effect sections both say that the effect extends from the point of origin in straight lines.
Think of AoE spell effects as summoning a light bulb to which everything solid is opaque (oversimplification a bit). If it's in shadow, it's not affected.
Yes, an AoE usually works that way, but in the 2024 version of the spells, the wording "spreads around corners" has been removed from some. I'm also guessing the reason is the one Thezzaruz mentioned.
2014. https://www.dndbeyond.com/spells/2102-fireball
2024. https://www.dndbeyond.com/spells/2618887-fireball
Is there a mechanical difference with "goes around corners" removed?
I am wondering if "goes around corners" was intended to mean cover provides no bonus to your dex saving throw....
The mechanical effects of "goes around corners" were never super well-defined, which may be why it got removed.
The 5.5e rules on AoE spells say:
Which to me says that in 5.5e, Cover does provide protection against a spell like Fireball unless the spell explicitly says otherwise, regardless of how it was meant to work in 5e.
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I haven't read the new PHB with that much detail as I'm playing 5e myself, but I guess that would fall on the DM (like everything).
I would argue that with 5e rules you can't hide behind a rock to avoid a Fireball, but with 5.5e you can just based on that text. A Fireball is an explosion originating from a point. You might say things that are not on direct trajectory from the point of origin are not hit.
Edit: wagnarokkr beat me to it.
I was also curious about this change, and I made a list of other spells (probably not a complete one) with a similar update, if it's interesting to anyone:
I can see cover working against an explosion but not working against a gas.
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