It's a long walk, even for a vampire.  He won't get tired, obviously, but if he has to walk all that way he might get debilitatingly bored.  Unfortunately there doesn't seem to be much else around.

As he comes closer it becomes clear that whatever this thing is and whatever it's doing there, it's more like a single oversized plant - many times larger than a city - than a forest.  Thick tangled thorny vines and layers of bark and bulbous protrusions a bit like pitcher plants.

Walk.

Walk.

Walk.

Walk.

Fuck walking he'll run.

Run.

Run.

Run.

Yeah this is faster though.  This thing is huge.

There's plant-creatures moving around just outside it.

Are they plant dragons. Is that what his life is right now.

They don't have wings!  They're smaller!  The horrible stench of dragon blood is weaker as you get closer to the giant plant thing, as Sadde will notice if he's turned his nose back on!  Maybe they're something else.  Or maybe they're just small flightless plant dragons.

...do they attack him if he gets close.

One of them - something slender and four-legged with a tangle of vines for a body - spots him and sprints off.  A few heavier-duty ones approach, cautiously.

"Can you understand me?" he asks.

The creature nearest him is rhino-sized and bulky.  It seems to be some sort of large, poorly-specified root vegetable.  Leafy stalks extend from its head and back like spines.  Thick white root-tendrils poke out from under its feet, and grow from its head like a beard.  It has no visible eyes, but the way it moves its head seems to suggest it can see, somehow.

It cocks its head to one side when he speaks, like a perplexed dog.

"I should be able to understand anything you say, if you can communicate somehow."

If it understands, it doesn't reply in speech.

It lowers its head towards him, slowly and gently.  Root-tendrils raise slowly and gently like tentacles; if he allows them, they will start prodding curiously at his face.

If it communicates with something other than speech he should be able to understand it anyway so he'll just wait and let it prod.

He is prodded.  The first tendril curls back in surprise when it feels how cold and stonelike his skin is, but after a moment, prodding resumes.  The tendrils trace out the shape of his face delicately.  It doesn't seem to be communicative.

After a while, the plant-creature's head draws back, and its tendrils relax.

Another creature approaches: two-legged and built for bounding, like a kangaroo.  Its legs are potato-brown like the first creature's, but its upper body is a tangle of leaves and thorns.

It bounds toward him, and sits for a moment, and then bounds a few hops away from him, and turns to face him again.  Inasmuch as it can look anything without a face, it looks expectant.

...alright, he'll follow the kangaroo thing.

It stops and looks back every few hops at first, but once it's convinced he can keep up, it speeds up.

After a while the hopping-vine creature leads him to a group of ambulatory bushes replete with fat red fruit, and an enormous squat pitcher plant the size of a hot tub, carried on six squiggly root-legs.  The bushes approach and present their fruit; the pitcher plant raises its upper covering-leaf and shades its pool against the sun, wiggling meaningfully as if to invite him in.

The vine-creature fixes him with another expectant look.

"—I don't, ah, need to eat, but thank you. I'm also—very fast?" He zips somewhere a mile away, waves, then returns.

All the plant-creatures jump back in startlement.  The vine-creature curls its vines uncertainly, then turns around and bounds away as fast as it can.  (Sadde's top speed is still much faster.)

Yeah he can show that. "Also I don't get tired and don't need to breathe, so you can just show me the way, you don't need to worry about carrying me. It's very kind, though."

Plant-creatures don't respond.

The vine-creature's route takes them gradually closer to the enormous wall of plant.  Eventually they arrive at - 

Well, it looks like a patch of enormous plant wall exactly like every other such patch.  But as they approach, vines and thorns and plates of bark shift aside, making a gap that expands into a gateway big enough to admit a truck.

The ground on the other side of the wall is startlingly more lush, covered in bright green grass and bushes.  There's a dirt road leading to a distant city, and a pair of building-shaped trees flank the entrance.

A couple of actual human people emerge from one tree, carrying what look like maces with tangles of living thorns for heads.  They approach.  The older one, who seems to be taking the lead, looks him up and down.

"You got here fast," he says.  "You okay, son?"

"Yeah, I am. You were warned I was coming?"

"Scout saw you, our technician got word through our Wellspring.  Come on through.  What were you doing out in the Wastes?"

"I'm from another world, I'm not whatever species probably human you are, I arrived there, a dragon thing attacked me, I killed it, then these plants brought me. My name is Sadde."

The man's eyebrows raise.  "Another world?  How d'you mean exactly?"

"You killed a dragon?" the younger man says.  "On your own?"

"This isn't the only universe there is, and I have a means of mostly undirected interdimensional transportation which led me here. I'm also a ridiculously overengineered species, very immortal, so yeah I killed a dragon on my own. ...well I punctured its brain on my own, that might perhaps not have been enough to kill it depending on how dragons work. It did stop moving."

"That probably did it," old man says.  He exhales heavily.  "Get all the blood off?  - That's important, you don't want any of it in the water."