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Reverse Gravity allows affected creatures to try not to fall:

This spell reverses gravity in a 50-foot-radius, 100- foot high cylinder centered on a point within range. All creatures and objects that aren't somehow anchored to the ground in the area fall upward and reach the top of the area when you cast this spell. A creature can make a Dexterity saving throw to grab onto a fixed object it can reach, thus avoiding the fall.

It clearly defines what happens to creatures that fail the save:

If some solid object (such as a ceiling) is encountered in this fall, Falling Objects and creatures strike it just as they would during a normal downward fall. If an object or creature reaches the top of the area without striking anything, it remains there, oscillating slightly, for the Duration.

However it has no guidance for what happens to creatures that succeed it. They are left hanging from the floor, (which is relatively speaking the ceiling for them), and all we know from the spell is that they must be using at least one arm to maintain that state.

There are a few questions to resolve in ruling on this:

  1. Are they easier to hit? Maybe not - heavy armor is still good at deflecting missiles, and characters with light armor could be swaying and swinging to dodge.

  2. Can they keep hanging on indefinitely? Should they be making Strength saves or Athletics checks to hang on? Presumably it should be easier to hang from whatever they're holding if they are holding on with 2 hands?

  3. (How) can they move? There are rules for climbing, but not climbing across a ceiling (which is what the floor is currently acting as), save some monsters' Spider Climb ability. My guess would be that it would be an Acrobatics rather than Athletics check (swinging from handhold to handhold rather than pulling yourself up).

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Spells do (only) what they say

So, from the point of view of the spell, answering your questions:

  1. The spell doesn't say anything about them being easier or harder to hit, thus they aren't (necessarily).
  2. The spell doesn't say anything about later checks or saving throws, thus they aren't forced.
  3. Unclear.

So, purely from the spell, we can't say much. Everything else is...

Up to the DM

Now, how do we adjucate the fact that the character is hanging in something?

Our brain is used to usual gravity, so let's just think on usual gravity. As for when the character is hanging into the object, we could just think of a character hanging into a chandelier (most usual thing to grab in the ceiling I can think of). It also helps because this is a situation more likely to be experienced by players and DMs. I've had rogues actually jumping from objects (specifically chandeliers) in the ceiling to dodge enemies that were in the ground, for example. So, back to your question:

  1. That depends on the object the character is hanging into and how exactly he is. We could approximate his condition as simply Grappled or, in a worse scenario, as Restrained.1 Certainly changing the AC is not consistent with other rules - even paralyzed or unconscious characters don't lose AC, even if they are in light armor (that is highly Dex dependant).

    • For the object they are hanging, for the chandelier example I'd ruled that the rogue could dodge as usual. He had some freedom on where to grab the chandelier and could move using his hands. Personally I didn't think that restriction was enough to give him "disadvantage at dodging" (a.k.a. being attacked with advantage). If he was hanging in a pole-like object, though, maneuvering would be harder (I think, at least) and the disadvantage at dex saves and advantage for attacks made against him would apply.
  2. That depends on how you rule climbing. Simply hanging is obviously easier than climbing. If you take into account their weight and carried weight in defining your climbing DC, do the same here. I think the most important thing is to be consistent. For me, I actually ignore every encumbrance rule from PHB :) - and from experience with other tables, it's one of the most ignored rules in the game. From that perspective, I would say the character can easily keep hanging in the object, if that's all he wants to do.

  3. For movement, I'd say "climbing the ceiling" (like Spider man does) is not a thing, unless they have something that can help them with that. We can climb walls because we can actually grab the rocks in a way that it nullifies the gravity vector. Doing that in the ceiling would need the ceiling to specifically allow it somehow (holes or something like that). They could, however, move jumping from one object to another (think Prince of Persia?) and I would rule that it requires either Acrobatics (preferably) or Athletics (possible). Note that from my first point, doing so actually requires an Action, not Movement speed, as the MS is zero2, meaning they can only jump once per turn.

I can't think of anything more illustrative for the ruling than the chandelier example. The fact that the gravity is reversed and now the floor is the ceiling essentially changes nothing, except for the objects that will be used.

Finally, I would note that objects in the ground, contraty to objects in the ceiling, usually are not anchored to the ground because they don't need to. That's the main reason I think it's easier to think in the usual situation rather than the reversed. In particular, I would like to emphasize the condition for being able to make the Dex ST:

A creature can make a Dexterity saving throw to grab onto a fixed object it can reach, thus avoiding the fall.

This objects needs to exist, i.e. an object that is fixed (anchored to the floor) somehow.


1 About the Grappled/Restrained condition, I use them as approximations because they are the closest I can find inside the rules that fit decently with the described situation, either as conditions or as spell effects overall. You clearly can't "move" while grabbing something to not fall (grappled) (unless you get some foot support) and if the object you are grabbing onto is not a good support, you will have difficulty doing anything with either your body or arms (similar to how restrained works).

2 While we have rules on Jumping from the Special Movement section, you aren't literally jumping, since you aren't even using your legs. Jumping with your arms is alot harder than with your legs. This is my reasoning to spend an action jumping from one object to another.

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  • \$\begingroup\$ I like the way you have approached this (as a specific case of ceiling hanging adjudicated separate from the spell), and think this is a broadly good answer. Could you elaborate on why you think Grappled/Restrained is an appropriate approximate condition? I am a little skeptical about the need for jumps to nearby objects to be an action given the jumping movement rules. \$\endgroup\$ – Vigil May 31 '18 at 23:05
  • \$\begingroup\$ @Vigil you aren't literally jumping though, since you aren't even using your legs. Jumping with your arms is alot harder than with your legs :P \$\endgroup\$ – HellSaint Jun 1 '18 at 0:40
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    \$\begingroup\$ @Vigil about the Grappled/Restrained condition, I use them as approximations because they are the closest I can find inside the rules that fit decently with the described situation, either as conditions or as spell effects overall. You clearly can't "move" while grabbing something to not fall (grappled) (unless you get some foot support) and if the object you are grabbing onto is not a good support, you will have difficulty doing anything with either your body or arms (similar to how restrained works). \$\endgroup\$ – HellSaint Jun 1 '18 at 0:43
  • \$\begingroup\$ excellent point about leg-jumping! And that does make sense to me as a sort of self-imposed, self-c0ntrolled grappled/restrained. If you incorporated these comments into your answer I would be happy to accept & bounty. :) \$\endgroup\$ – Vigil Jun 1 '18 at 7:36
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    \$\begingroup\$ @Vigil I've added them as footnotes, so the answer is a little more clean IMO. Adding them to the main body would make the answer too big and too chaotic (changing from how I rule it to the explanation for it). Hope it's fine now :) \$\endgroup\$ – HellSaint Jun 1 '18 at 7:48
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This would necessarily involve a lot of adjudication on the part of the DM. The most important factor would be what they have available to possibly grab onto. If there's a table bolted to the (former) floor, then this is easy. If the best they can do is try to grab the carpet with their gauntleted hands, then the initial Dex save is probably at disadvantage, at best, and rolls to keep a grip on it may be appropriate.

  1. I would not change their Armor Class; that seems to be treated pretty much as a constant in 5e. Maybe certain attacks against them could be at advantage, but being grappled doesn't even give advantage, so I would probably just check to see if they are acting to still have use of their shield (which means not doing much else but shielding and holding on), and maybe give the attackers a +2 to hit due to circumstances.

  2. Reverse Gravity only lasts 1 minute, maximum, so I would not generally bother with Strength or Athletics checks to hang on if they have something decent to hang on to. Check their carrying capacity against their weight (including equipment); if the carrying capacity is greater, then I'd let them hang on for the minute. Weak characters, or those with excessive stuff, may risk falling, or have to drop some of their things. Remember that carrying is 15x Str, so I'd call that the minimum for trying to move from handhold to handhold. Simply lifting is 30x Str, so I'd use that if all they are trying to do is hang on with both hands. Most characters will be capable of that.

  3. I would agree Acrobatics would be the most applicable skill, if there are things to jump for. Athletics is also a reasonable call; I'd let a character try either, if there's anything to work with.

Of course, being able to cast Feather Fall, Levitate, Fly, Spider Climb, even Jump under the right circumstances, or a few other spells can help. Or if the character has a grapnel, hook it over the furniture or into the carpet, and climb or slide "down" the rope. (Until the end of the spell, then do it all again.)

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  • \$\begingroup\$ I like a lot of this answer - but I think it could be improved by an illustrative example. \$\endgroup\$ – Vigil May 31 '18 at 10:05

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