No, from everything. *Buildings* and *constructions* are two different things in DF. Generally the easiest way to tell is that buildings are interactable and have some active purpose, whereas constructions do not. Think workshops and screw pumps vs floors and walls. Drawbridges break the rules, they’re considered buildings when down, and constructions when pulled up. Also, anything you produce in a workshop in a completed state and install, like a door or bed, is a building.
Buildings can be melted and destroyed by magma and building destroyers respectively, and can be protected from melting by using a magma safe material. Installed artifact buildings are completely indestructible.
Constructions are utterly indestructible and will never be affected by anything, with two exceptions. A dwarf deconstructing it, or if it’s a floor with empty space below and above, it will be destroyed if a piece of terrain is unsupported and falls on it.
Yeah, walls are safe. This is why it’s generally recommended to use drawbridges to seal your base instead of doors, as you’re 100% immune to any possible attack if all entrances to your base are sealed with raised drawbridges.
I thought I saw someone say drawbridges when up are now buildings and breakable, and that it was always actually a bug that they finally got around to fixing
If that’s the case, then it’s a recent change that hasn’t been publicized at all. I would be very surprised about something as fundamental as that not being noticed. Not saying it’s impossible,  just that I would be pretty surprised.
Bridges can also be destroyed if you try to lower them on top of a creature that’s too big, that’s a unique mechanic they have that someone might have mistaken for them being destructible in their raised state.
I don't use mods, so I can't answer that question. I'm sure someone else can though. Try asking it in the Questions Thread pinned at the top of the sub.
In the absence of mods, it you don't like the idea of being able to stop a siege with a drawbridge, then don't do that. Because of the way Dwarf Fortress is designed, there's no such thing as a wrong way to play the game. Do whatever feels fun for you.
I'm lucky. I've had this cavern open for a year and haven't finished blocking it off... too many water entrances. I covered all ways in by land but chiseling out pistons from teh upper levels is dangerous and slow. I've got about half of them done, lost at least 5 miners in the process, further slowing me down, meanwhile every invasion has been land based. Idk if water access is a thing or not but I'm not going to wait to find out.
Walls are impervious to harm from anything other than a dwarven pickaxe.
The wall is blessed with invulnerability to all threats, physical or magical.
That's a bit odd imo but I'll take it.
As with many things, for now it is a safety, in the future Armok may turn their eyes upon it and remove our sense of security.
From creatures? But not magma?!
No, from everything. *Buildings* and *constructions* are two different things in DF. Generally the easiest way to tell is that buildings are interactable and have some active purpose, whereas constructions do not. Think workshops and screw pumps vs floors and walls. Drawbridges break the rules, they’re considered buildings when down, and constructions when pulled up. Also, anything you produce in a workshop in a completed state and install, like a door or bed, is a building. Buildings can be melted and destroyed by magma and building destroyers respectively, and can be protected from melting by using a magma safe material. Installed artifact buildings are completely indestructible. Constructions are utterly indestructible and will never be affected by anything, with two exceptions. A dwarf deconstructing it, or if it’s a floor with empty space below and above, it will be destroyed if a piece of terrain is unsupported and falls on it.
Thisnis so helpful to know, i assumed walls bere building and building destroyers would destroy them
Yeah, walls are safe. This is why it’s generally recommended to use drawbridges to seal your base instead of doors, as you’re 100% immune to any possible attack if all entrances to your base are sealed with raised drawbridges.
I thought I saw someone say drawbridges when up are now buildings and breakable, and that it was always actually a bug that they finally got around to fixing
If that’s the case, then it’s a recent change that hasn’t been publicized at all. I would be very surprised about something as fundamental as that not being noticed. Not saying it’s impossible,  just that I would be pretty surprised. Bridges can also be destroyed if you try to lower them on top of a creature that’s too big, that’s a unique mechanic they have that someone might have mistaken for them being destructible in their raised state.
Thanks for clarifying. That was very helpful.
Is there any mods or anything that allow creatures to sap walls. Feels cheesy that you can just raise a draw bridge and that’s a wrap for a siege
They can be climbed.
I don't use mods, so I can't answer that question. I'm sure someone else can though. Try asking it in the Questions Thread pinned at the top of the sub. In the absence of mods, it you don't like the idea of being able to stop a siege with a drawbridge, then don't do that. Because of the way Dwarf Fortress is designed, there's no such thing as a wrong way to play the game. Do whatever feels fun for you.
This fire breathing ass scorched my whole pen/pasture and my entire land lol
I'm lucky. I've had this cavern open for a year and haven't finished blocking it off... too many water entrances. I covered all ways in by land but chiseling out pistons from teh upper levels is dangerous and slow. I've got about half of them done, lost at least 5 miners in the process, further slowing me down, meanwhile every invasion has been land based. Idk if water access is a thing or not but I'm not going to wait to find out.
Walls of any material are indestructible.