So what if one of your characters before fighting a powerful dragon you go to a blacksmith or merchant and get a giant muzzle that will fit a dragon. then while you are fighting the dragon one of your high strength characters can put it around the dragons snout and a spell caster can cast arcane lock on it bye bye breath weapon.
If you can make that happen to an active dragon, you don't need it.
I second this. Here's the question you should be asking:
So what if one of your characters before fighting a powerful dragon you go to a blacksmith or merchant and get a giant dagger that will kill a dragon. then while you are fighting the dragon one of your high strength characters can put it into the dragons body and a spell caster can cast telekinesis on it bye bye breath dragon.
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Look at what you've done. You spoiled it. You have nobody to blame but yourself. Go sit and think about your actions.
Don't be mean. Rudeness is a vicious cycle, and it has to stop somewhere. Exceptions for things that are funny. Go to the current Competition of the Finest 'Brews! It's a cool place where cool people make cool things.
How I'm posting based on text formatting: Mod Hat Off - Mod Hat Also Off (I'm not a mod)
To address the question more directly: RAW there's no way to "shut off" a dragon's breath weapon, as with most monster abilities. You can ask your DM if they're open to some move like this, but they're under no obligation to allow it.
Also, Arcane Lock specifically says that it functions on "entryways", so strictly speaking it can't be used in this context in the first place.
This would be next to impossible to do on any dragon older than Young Adult. The head of most Adult chromatic dragons is about as big as a Medium-sized creature. Carrying around a muzzle that big would not only be heavy, but also very cumbersome. Then actually getting an object that large around the dragon's head??
If you really want to build something, make a spring-release trap with a chain that you can attach to a very heavy, sturdy "object" like an old tree. If you can bait the dragon to step on the trap, you can at least Restrain the dragon for 1 round.
So what if one of your characters before fighting a powerful dragon you go to a blacksmith or merchant and get a giant muzzle that will fit a dragon. then while you are fighting the dragon one of your high strength characters can put it around the dragons snout and a spell caster can cast arcane lock on it bye bye breath weapon.
If you can make that happen to an active dragon, you don't need it.
I second this. Here's the question you should be asking:
So what if one of your characters before fighting a powerful dragon you go to a blacksmith or merchant and get a giant dagger that will kill a dragon. then while you are fighting the dragon one of your high strength characters can put it into the dragons body and a spell caster can cast telekinesis on it bye bye breath dragon.
Look at what you've done. You spoiled it. You have nobody to blame but yourself. Go sit and think about your actions.
Don't be mean. Rudeness is a vicious cycle, and it has to stop somewhere. Exceptions for things that are funny.
Go to the current Competition of the Finest 'Brews! It's a cool place where cool people make cool things.
How I'm posting based on text formatting: Mod Hat Off - Mod Hat Also Off (I'm not a mod)
To address the question more directly: RAW there's no way to "shut off" a dragon's breath weapon, as with most monster abilities. You can ask your DM if they're open to some move like this, but they're under no obligation to allow it.
Also, Arcane Lock specifically says that it functions on "entryways", so strictly speaking it can't be used in this context in the first place.
This is very much one of those situations where "being able to try it" is radically different from "being able to successfully do it."
Find your own truth, choose your enemies carefully, and never deal with a dragon.
"Canon" is what's factual to D&D lore. "Cannon" is what you're going to be shot with if you keep getting the word wrong.
I believe the spell you are looking for is Hold Monster
Just published a map on DriveThruRPG The Forgotten Temple
This would be next to impossible to do on any dragon older than Young Adult. The head of most Adult chromatic dragons is about as big as a Medium-sized creature. Carrying around a muzzle that big would not only be heavy, but also very cumbersome. Then actually getting an object that large around the dragon's head??
If you really want to build something, make a spring-release trap with a chain that you can attach to a very heavy, sturdy "object" like an old tree. If you can bait the dragon to step on the trap, you can at least Restrain the dragon for 1 round.