Quote from A_Mad_Man_With_A_Box >>

So question... does the door open ON you or like right in front of you (since the creature you can take can be 5 feet away from you)... what I'm thinking is opening a door for a Rouge (who's multi classed) using it to steal something from a desk or a weapon from an opponent ..... 

 It is not a Door, it is an instantaneous teleportation, from Spot A, to Spot B. It is just named Dimension Door.

Nothing opens, nothing creates a portal, or a rift. You disappear and reappear in the specified spot, which can be up to 500ft away, which has the requirement of you either being able to see, know about (Visualizing), or can describe where you want to go. If the space you teleport to is occupied by an object (like boxes), or a person, then it fails and you roll 4d6 force damage on yourself. This will also damage any ally you have with you, as long as they are willing, and within 5ft of you.

So no, a Rogue (Who multiclassed) with it, can't pickpocket, steal, or remove an item from a specific spot with it. They have to teleport themselves *into* the room, or area, to be able to take the items or object. This is why the duration is Instantaneous, and doesn't have a timed duration.

We used it last night to get inside Arauthator‘s stomach and kill  him from the inside our dm said if he wanted to leave he would have to cast it again. So it would be a no for casting it and it staying open.

Let's say a warlock says "Come with me", the character agrees.  The warlock casts dimension door, which is NOT EXACTLY what was consented to.  Should that count as consent?  Asking after being the potential victim of a  homicidal player.

Great use for the Genie Warlock's vessel. Load everybody inside and then Dimension Door away. Mass Dimension Door.

Quote from Puttus >>

Let's say a warlock says "Come with me", the character agrees.  The warlock casts dimension door, which is NOT EXACTLY what was consented to.  Should that count as consent?  Asking after being the potential victim of a  homicidal player.

 Just read the rules and do what they say.  That's it. The rules for the spell say, "must be willing."  That's it.  This person isn't "willing" to go through the dimension door spell, so they're not willing.

Quote from EshrielGexsoth >>

We used it last night to get inside Arauthator‘s stomach and kill  him from the inside our dm said if he wanted to leave he would have to cast it again. So it would be a no for casting it and it staying open.

 How did you use it to get into the stomach? 

1. The rules for the spell say you have to see the destination.  Could you see inside the stomach somehow? 

Or they say you have to give a direction and distance (like, "200' straight ahead").  Did your DM let your PC take out a very long tape measure during (I presume) a hostile encounter and measure the exact distance from your origination point to the center of the belly of the beast?  If not, and you were (presumably) in combat, with everyone dancing around, you couldn't have gotten your destination position locked down accurately. 

2. The second option in the rules is that you have to be able to "visualize" the destination. A bit subjective but most take it to mean a place you've been before, or seen before.  Thereby you can picture it clearly in your head, even though you can't see it IRL at the moment.  So unless your PC has been swallowed by that dragon before (and you had a light source while you were inside there), or have conducted an autopsy on that dragon before, you have no idea what it's digestive track looks like. 

3. Last, but most important - it says that if you're teleporting where something (object, creature, etc) already exists, the spell will fail and you'll take 4d6 damage.  So, right from the start - you point at a square on the battlemap and say, "I teleport there!" and the DM notices there's a miniature of an object or creature (Arauthator) already in that space.  DM says, "Ok, it fails, take 16 force damage."  Though, if they're kind & generous, they may first ask, "you DO realize there's a creature or object already in that square, correct?" in case you wanted to change your declared Action.

But let's say, for fun, that your GM is INCREDIBLY generous and it's a more goofy campaign, and you say that the point in space YOU want to teleport to is empty and available - a giant, open space inside of the beast.  Like the belly of the whale in Pinnochio. Well, the problem is that the Arauthator is not a giant whale - it is listed as HUGE, and huge is only defined as 15x15'. If we look up dragon-like reptiles of today that are about 15' in size, we find the saltwater croc. And if we look on ResearchGate, there's a picture of the saltie's digestive tract and the stomach appears a very irregular shape less than 1 ft x 1 ft in size.

While it is true that a saltwater croc of sufficient size COULD eat a whole 200lb human, the fact is that it wouldn't be able to swallow that human whole.  They would have to chew and dismember and work to shove it all down with the esophagus and stomach stretching to accommodate the meal. Yes, the stomach may expand, stretching somewhat when it eats bigger meals, but by default, it's pretty small unless you were teleporting in as a frog-sized creature.  And even then, I doubt that 1' stomach sack just sits there wide open like a 1 ft diameter balloon - it's probably smushed and nearly deflated (except for stomach acids) when it's not expanded to eat something.  Thus, you'd have to be about the size of a frog to even hope for an empty pocket of space, but even then you'd be landing in digestive juices.  And I guess you'd have to be even smaller than that if you took someone with you.  And heaven forbid the Arauthator has eaten recently and the stomach you just tried to teleport into is already full! (re-read point #3, above, about taking damage for trying to teleport into an object).

But back to the twisting and jolting as the creature dances and dodges in combat - that means you'd be trying to hit (get into) a moving target - the 1 ft stomach bouncing around.  The spell rules don't cover that.

In summary, you GM was being VERY generous to allow you to assume you knew the size, description, and location of a pocket of air inside that creature big enough to safely fit you and your companion.  Buy them a smoothee on your way to the next game session. 

Being rather familiar with this particular spell through observation of other games streamed, as well as a couple of other teleportation spells and one spell having to do with creating an Arch, I decided to check the actual details of Dimension Door.  After reading the description and comments, I'm aware that this badly named spell doesn't produce a physical or magical door.  It's a teleportation spell that I and a willing creature can be "beamed away" with.

So here is my scenario and hopefully  someone can give me some guidance on what would be the best spell to pull this off.

A Rogue party member has done a little stealthy recon, mostly successful, in a building with a few enemies around.  Invisible and decently stealthy, someone comes into the room and somehow is made aware of their presence.  The Rogue leaps through a window to try to escape, but the weather is decreasing their stealthy abilities, especially compromising their invisibility and their speed isn't very high so enemies are chasing them and catching up very quickly.

My character, disguised and nearby, notices my now not quite so invisible friend being chased and about to be captured.  Let's say my class and species aren't known at this time so any spell is possible here.  But I want to pretend I'm a "good Samaritan" and pretend to chase after my friend as well, hoping to get to them first.

Once I get to them, what is the best spell I can quickly cast, instant or within a couple of seconds, as I dive for the friend and make it look they are the one who cast a spell to send them away without my going too?  That way I can fake being upset that I failed to catch them because the enemies will think it was the escapee who cast the spell.

Range might play in, but even one or two hundred feet range is helpful for them to get to a place they can properly vanish in an area.

sos can anyone tell me why dimension door isn't showing up as an available spell for my lvl 4 bard? dndbeyond says it's free but it won't show up in the list of spells to add. i thought maybe it was a spell i needed to buy so i checked the digital players handbook and it doesn't show up in the spells list either. is it a glitch? or am i just dumb and missing something lol

yes

It would have to be at the DM's discretion... personally, as a physicist-DM, I'd rule that if you travel through a dimension door at high speed, you will have that same speed at the other end. However, a clever player could simply make the DD face upward on the ground, in which case his velocity vector would have its direction changed, and the player would only suffer the effects of an abnormally high jump.

The description states the additional creature must be "willing". But what if the creature is willing to go but the caster wants to go alone? Like, let's say the caster ended up in melee combat and uses dimension door to get out. However, the opponent really does not want the caster to teleport away and tries to impose themselves into that teleportation.

Not sure if you ever figured this out, but I am guessing you did not check "Additional Bard Spells under Optional Feature Manager in the Leveling/Class Manager Screen.  There are alot of spells/abilities that were added to classes in later books that are not default included unless you choose to allow them as they are considered "Optional".

It saids you can bring a willing creature along with you. Not any willing creature can come along. If you don't want them to they can't come with you. 

Quote from essieb >>

sos can anyone tell me why dimension door isn't showing up as an available spell for my lvl 4 bard? dndbeyond says it's free but it won't show up in the list of spells to add. i thought maybe it was a spell i needed to buy so i checked the digital players handbook and it doesn't show up in the spells list either. is it a glitch? or am i just dumb and missing something lol

Hi, its a 4th level spell and not a spell for 4th level bard. Starting 7th level a bard can learn and cast 4th level spells.

BR Lutz