Cast behind Wall of Force


Rules Questions


Can you pick a spot behind a Wall of Force as point of origin for a Fireball spell?

If so, I'm assuming the spread of the fireball would not pass through the Wall of Force of course.

Thanks for all the help!


No. You have to actually throw a bead at the point of origin. You could throw it over however.

*edit* In other words you have line of sight, but not line of effect.


Tanis wrote:

No. You have to actually throw a bead at the point of origin. You could throw it over however.

*edit* In other words you have line of sight, but not line of effect.

You Cannot lob a fireball! You are not physically throwing it but rather projecting force to send it flying in a straight line for 400+40 ft. per level.


The key to wall of force is that it breaks line of effect -- With line of effect the general rule is, "If they can't hit you, you can't hit them" -- unless a spell gives you a specific exception the general rule stands. Wall of Force blocks line of effect so you can't cast through it.

Some spells can be cast around it however -- fire snake for example might be able to go around the edge of it, and spreads might go around it too -- but your average burst spell is stymied by wall of force for you just as much as it is for your enemy.


Wall of Force, while invisible, is still a wall. The wall works both ways.


Inconvenience wrote:
Tanis wrote:

No. You have to actually throw a bead at the point of origin. You could throw it over however.

*edit* In other words you have line of sight, but not line of effect.

You Cannot lob a fireball! You are not physically throwing it but rather projecting force to send it flying in a straight line for 400+40 ft. per level.

I thought that's why mages developed Delayed Blast Fireball. :P


Your group could decide to houserule it so you basically throw fireballs in arcs over the wall, however that will mean the guys on the other side get to do this too... but generally I agree with the rest of the guys here, I imagine fireballs flying straight and being somewhat physical so force stops them.
Go with mind effecting spells for bypassing force walls, they are great and not physical.

Other idea: Ask for a metamagic feat that lets the fireball blink like the arcane archers phasing arrows

RPG Superstar 2012 Top 16

Technically speaking, a fireball is a burst...you don't throw it or project it, you just cause an explosion at the point indicated. The 'little pea shoots out and explodes' is a 1E holdover.

That said, bursts still take line of effect, and the wall stops that. You can no more cast on the other side of it then you can cast on the other side of a castle wall. Now, you can cast ABOVE it...and it does have a 20' burst radius, and could presumably still hit most of the stuff just behind it.

===Aelryinth


Aelryinth wrote:

Technically speaking, a fireball is a burst...you don't throw it or project it, you just cause an explosion at the point indicated. The 'little pea shoots out and explodes' is a 1E holdover.

That said, bursts still take line of effect, and the wall stops that. You can no more cast on the other side of it then you can cast on the other side of a castle wall. Now, you can cast ABOVE it...and it does have a 20' burst radius, and could presumably still hit most of the stuff just behind it.

===Aelryinth

I thought fireball's area was a spread and thus turned corners. So if it impacted with an invisible wall of force and "went off early" then the area would bend around the top of the wall (or around the edge if near it) and damage those directly on the otherside.


Ringtail wrote:
I thought fireball's area was a spread and thus turned corners. So if it impacted with an invisible wall of force and "went off early" then the area would bend around the top of the wall (or around the edge if near it) and damage those directly on the otherside.

It is and it could -- but it doesn't get "free movement" either -- you have to measure around the wall.

So if the wall (any wall for this case) was 15 foot high, and 5 foot thick and the fireball hit at the five foot mark it would have to go up 10 over 5 and then back down. Since it's only a 20 foot spread it would get those at the top of the wall -- but not the bottom.

Holes bigger than a foot would allow the spell through too.


Aelryinth wrote:

Technically speaking, a fireball is a burst...you don't throw it or project it, you just cause an explosion at the point indicated. The 'little pea shoots out and explodes' is a 1E holdover.

That said, bursts still take line of effect, and the wall stops that. You can no more cast on the other side of it then you can cast on the other side of a castle wall. Now, you can cast ABOVE it...and it does have a 20' burst radius, and could presumably still hit most of the stuff just behind it.

===Aelryinth

Have you read the fireball description? 1E holdover or not, the rules clearly state that the glowing bead has to be able to reach the point indicated without striking anything in order for the explosion to happen at that point. If it impacts anything before reaching that point, like say an invisible wall, it detonates on whatever it hit.

So, yeah, you ARE projecting the spell through space.


Aelryinth wrote:

Technically speaking, a fireball is a burst...you don't throw it or project it, you just cause an explosion at the point indicated. The 'little pea shoots out and explodes' is a 1E holdover.

Doesn't matter (and it isn't a hold over any more than anything else in the spell is) -- line of effect -- you must have line of effect. Without line of effect it doesn't matter what you can see -- you can't hit the target. The magic section makes this very clear.


Ok, thanks for all the answers.

Fireball was obviously a bad example, I had missed the detail you actually have to toss a bead at the designated location lol Obviously a force of wall will block that.

Ok, so let me try this again: how about a summon monster spell?

As far as I can read, the monster pops up where you designate it, and it doesn't require you to throw anything (pls correct me if I'm wrong).

So can I summon something behind a Wall of Force?

Dark Archive

Rocky16 wrote:


So can I summon something behind a Wall of Force?

No.

Core Rulebook (pg. 215): wrote:


Line of Effect: A line of effect is a straight, unblocked
path that indicates what a spell can affect. A line of effect is
canceled by a solid barrier. It’s like line of sight for ranged
weapons, except that it’s not blocked by fog, darkness, and
other factors that limit normal sight.
You must have a clear line of effect to any target that you
cast a spell on or to any space in which you wish to create
an effect. You must have a clear line of effect to the point of
origin of any spell you cast.

<SNIP>

Summoning a monster is a spell and an effect. You do not have line of effect.

Wall of force does not allow spells to pass through. Summon Monster is a spell.

Hope that answers your question. :)

Cheers


Lord oKOyA wrote:
Rocky16 wrote:


So can I summon something behind a Wall of Force?

No.

Core Rulebook (pg. 215): wrote:


Line of Effect: A line of effect is a straight, unblocked
path that indicates what a spell can affect. A line of effect is
canceled by a solid barrier. It’s like line of sight for ranged
weapons, except that it’s not blocked by fog, darkness, and
other factors that limit normal sight.
You must have a clear line of effect to any target that you
cast a spell on or to any space in which you wish to create
an effect. You must have a clear line of effect to the point of
origin of any spell you cast.

<SNIP>

Summoning a monster is a spell and an effect. You do not have line of effect.

Wall of force does not allow spells to pass through. Summon Monster is a spell.

Hope that answers your question. :)

Cheers

Bingo! Exactly the answer I was looking for, I could have sworn I had read something along those lines in the core rulebook, but couldn't find it again during our last gaming session.

Thanks a lot!!

Dark Archive

You're welcome.

It is hardly an official answer and an argument could be made to allow it if one tried hard enough. Some GMs could likely play it the other way, so be sure to check with your GM to be sure.

Cheers


Solution: Gaze attacks.

Dark Archive

Troubleshooter wrote:
Solution: Gaze attacks.

True.

Or...

It isn't always possible or the desired order of actions... but one can always summon the monster first and then put up the wall after. :)

Cast while invisible for maximum effect.

Cheers


You could Wall of Force their Wall of Force.

They can Dismiss their own. They can't Dismiss yours.

On a related note -- awwwwwww. I tried doing the math to see if you could drown them out with Create Water but the numbers just aren't in your favor, even if they create a really small room with the Wall.

Edit: And it's just 1 round/level now. Wow.

Liberty's Edge

is there an official answer to this anywhere?


Summon a monster with a fly or burrow speed, on your side of the wall, or inside you emergency sphere :)


Qstor wrote:
is there an official answer to this anywhere?

Yes. In the Core Rulebook, as quoted above.


Kyle Zimmer wrote:
Summon a monster with a fly or burrow speed, on your side of the wall, or inside you emergency sphere :)

Or Teleport/Dimension Door past(or other spells of the teleportation subschool). As long as access to the Astral Plane exists they can bypass the Wall as well.

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