Hard to tell, it's rather dark. Some sort of... room or tunnel or road, maybe. The walls, floor and ceiling are all stone, the latter rough and unworked, the former carved smooth. Faintly luminescent lichen crawls up the walls providing just enough light to make out vague details.

She lands in a crouch, the rift in nothingness sealing behind her.

She takes a deep breath, closes her eyes (the Rinnegan is thoroughly distracting) and tries to center herself enough to sense chakra. (She's been trying to master silent killing, after all). 

Can she feel anyone alive?

As far as chakra is concerned, this place is completely, utterly dead.

Interesting.

She opens her eyes again, places her hand on one wall, and starts walking forward. She'd ideally like to find somewhere defensible to rest - she's been fighting several days, now, and she is low on chakra without Naruto to continually top her off.

Absence of chakra or no, it's not long before she hears the sounds of battle, down the left of a T-intersection. Bestial screaming, metallic crashes, and the crackles and snap of stranger powers.

She's exhausted, but she's fought in worse circumstances, and this might be fun. And she might even acquire an ally, if she plays the big damn hero correctly.

She heads left.

There's a young woman facing a horde of monstrous humanoids. She's flanked by five ghostly figures. One looks very much like her and doesn't seem to be doing anything. Another wreathes her in a glowing shield, while the others toss various forms of destruction into the writhing mass. A sixth ghost rampages through the melee, like a malformed dog the size of a small car, knocking bodies aside with each swing of its arms.

Oh, fun!

She hasn't seen a technique exactly like that before - she wonders if it's like Kakuzu's stolen hearts, or Pein's puppeted bodies.

Still...

She doesn't need much chakra to throw a set of terrifyingly accurate kunai into the monsters, slamming through eyes into brains fast enough to cause little cracks like thunder.

And then with that opening she can chirp: "Get to the side!"

The blood and brain matter that spatters out is black and putrid.

She turns her head to look at the new arrival. "...Who the fuck are you?"

"Uchiha Hisame! I won't repeat myself, you know, and I'm not sure my aim with thrown lightning is going to handle going around you gracefully."

She gestures, and one of the ghosts at her side vanishes, replaced by another that begins throwing lightning into the horde. The beasts scream as their flesh is charred.

"I can handle my own lightning." She gestures again, and the lightning ghost swaps out for the previous one. "But in this case I prefer not to, as the smell of them cooking is the only thing worse than their natural odor." An errant current of air brings the stench back to them. It is, indeed, appallingly disgusting.

She laughs. "Very well. The slow way, then."

And she blurs, sprinting into the horde at speeds worthy of the fastest shinobi, drawing her sword and cutting a bloody swath through the creatures, deftly avoiding getting any actually on her, treating the walls and ceiling and floor and monsters alike as equally valid places to be running.

During the course of the battle, three basic types of monsters distinguish themselves. There are the basically human-sized ones that are most numerous, short, stocky ones that are slightly harder to kill, and the tall ones that move very quickly and seem to bend almost bonelessly. The monsters wear a mix of chain and plate armor, and are armed primarily with swords. A few carry shields, and some of the ones towards the back of the press have crossbows. Still, none of them are very intelligent. Between the two (or eight, depending how you count) of them, it doesn't take much longer before the pack of monsters are all dead.

Little bounce. (She's perfectly clean, still.)

Hisame turns to the stranger: "You're a good fighter."

"Mm." Her voice, now that it's quieter, has an odd quality to it. An echo, like it comes from more than one throat. She flicks her hand absently, and the lineup of ghosts changes. The shielder remains, as does the one that mimics her appearance. "As are you. Where did you come from?" That speed and strength are not natural, and there was mention of throwing lightning. Yet she senses no shard in this stranger, and sees no Tinker equipment. More evidence, as if it were needed, that she has traveled far indeed.

"From a rather unfortunately ended world. I fell between realities, and stepped out here. You're the first person I've met since. Do you know where this is?"

"Underground somewhere. This is not my home either."

"Interesting. I wonder if this labyrinth has its own end, or if I will need to start going straight up."

"None I have found in the past day. Many of these monsters, however, which seem to have a knack for interrupting whenever I begin making my own exit." She points up at the ceiling, which higher and rougher than in other areas.

"Well, if you can cover for me if more show up, I can open holes fairly quickly."

"Be about it, then. We are," she cocks her head toward one of the ghosts, as though listening. "One and one-quarter miles below the surface, at this point."

She smiles, backs off from her new friend, and points her sword up (it's an entirely unnecessary dramatic gesture, but Hisame doesn't know a single Uchiha who would ever pass up an opportunity for unnecessary drama). 

And lightning surges from her sword. It won't connect to the sky, not a mile and a quarter down, but it's going to blast through at least a few hundred feet.

It leaves her aching and sore - she'll be able to keep fighting a day yet, but it wouldn't be pleasant.

She smiles, almost despite herself.

Then turns, at a thumping rapidly approaching. "A big one," she murmurs.

It turns out to be two big ones, monstrous giants, fifteen feet tall and proportioned to match. Their roar when they see the two girls shakes loose rock from the roof.

It's just rock above them, no other floors to duck into, and she doubts the other woman will want to be carried while Hisame clings to the side of the wall - 

She blasts again, and again, and again, each cutting a bit more shallowly than the last, but all of them turning rock to a fine dust.