Illustration of the internal anatomy for my version of the warden. Shows how everything fits together. The main chamber of their digestive system takes up a large part of their abdomen, and some things can spend weeks in there slowly breaking down until they pass into the series of small chambers to have water and any additional nutrients drawn out in preparation for passing. The final chamber in the last section of a warden's digestive system is the longest, and this is what basically holds everything until it's passed. Their poo doesn't have much of a smell. Can be compared to a musty/mildewy smell with a distinct fungal undertone, very soft in consistency. It breaks down into something similar to a rich soil as it dries, and is actually extremely good fertilizer. For my personal lore, when a warden dies, their sculk colony dies off within a couple weeks, and so much of the cave stone has been converted to rich soil that it forms a lush cave biome.

Their anatomy is somewhat convergent to other creatures despite them being a form of fungus, but everything works in its own way.

A way to get rid of gases was necessary because of the way the chambers are set up, so there's an organ attached to the main chamber that extracts CO2 and prevents it building up too much. The CO2 is the only thing that passes through this unique organ, where it ends up in the lungs, and is exhaled with their breath.

Wardens, like other fungi, take in oxygen and put out CO2. Unlike normal fungi, wardens are actually thinking and moving creatures and require more oxygen than a normal fungus, so they breathe. They have blood, or at the very least something like blood, that is circulated by an organ serving the function of a heart. The blood-like fluid, while structurally and chemically different than actual blood, serves the same function blood does. It is blue and glows. A warden's blood can produce a potent high with mild psychodelic effects that lasts a few hours if ingested.

There's still a lot of dissolved CO2 that passes from the main digestive chamber into the series of smaller chambers, and this is simply passed in the same way as any other creature passes gas. In short... they fart a lot. Fortunately, it has little to no smell. Just kinda mushroomy and a little musty.

Wardens can usually detect if something is toxic to them while it is still in the first chamber of their stomach. They will simply throw up before it reaches the main chamber where it would cause problems. It's pretty easy to bring something up from the first stomach, even if unpleasant. In this case, they throw up about as much as you might expect for something their size. If something reaches the main chamber and makes them sick, it is a lot harder on them. Unlike the first chamber, emptying the second chamber is stressful and takes more effort. It's also always projectile, and there is a lot of it. Due to the enzymes in their main stomach chamber, their puke can cause damage to wood or similar material even if cleaned quickly. It will eventually turn spongy and start to break down. If in a dry environment, it is less noticeable, but the enzyme will cause the wood to retain moisture in the air, which helps the enzyme break it down.

Wardens drink a LOT of water. A good amount of it stays in the main chamber, aiding in breaking down the tougher materials a warden eats. Wardens can eat meat if it's cooked or already decayed enough to be mostly broken down. This is why their saliva has potent natural antibiotic properties. If the meat is not broken down enough to be absorbed fully by the first chamber, it passes into the main chamber where it will begin to rot. Small amounts they are alright with. They will feel sick, get some diahrea, but recover alright, but large amounts will make them violently ill. Severe vomiting and diahrea until all of the rotting meat is out of their system. This can take several days, leading to lethargy and dehydration. They can generally recover alright, but the whole ordeal is extremely unpleasant.

They entirely lack bile or stomach acids. All of their digestion is done with special fungal enzymes. The inside of their stomach chambers is full of long fibers that is comparable in function to mycelium. This is what draws the nutrients out as the food is broken down.

Wardens very much enjoy gnawing on bone and will happily chew on deer antler sheds if they come across them. While they live deep underground, they do sometimes venture to the surface for deadwood, leaf litter, bone, and other things they enjoy eating.

There are numerous musk glands that produce different sorts of pheromones. The musk and pheromones are effected by the warden's mood and the purpose of scent marking, with each gland shown actually being a cluster of glands. The amount of pheromone laden musk as well as the composition and thus what is being communicated can vary widely depending on the reason the warden is leaving their scent.