The chamber at the bottom widens and is lined with shelves filled with glass cages. We can see them because there are Ecobulbs hung from the ceiling, powered by a generator somewhere that must be the source of the humming we hear. And inside those cages are many, many rats.

"What the hell is going on? Those aren't rigged to break on us, I hope?" I say.

"No, is not trap. Is food for next trap."

"What?"

"Listen. You hear it ahead?" Perun points to an arched passageway at the other end of the chamber, with a single dim light illuminating it. "Under hum you hear hissing."

"Oh. Yes, you mentioned there would be snakes."

"Rats are food for snakes."

"How thoughtful of Weles."

Orlaith observes.

When did you eat a snake?

We pad down the corridor toward the sounds of hissing, which is not typically a good survival strategy. After a short distance the corridor ends abruptly at a wide pit about thirty feet square and perhaps twenty feet deep. The bottom of the pit has helpfully been illuminated so we can see that the floor is completely covered in writhing snakes. It's much too broad to jump. There appears to be an extendable bridge mechanism on the far side, and on our side is a helpful length of chain dangling from the wall with an illustration beneath it showing a bridge over the pit.

Perun is about to pull on the chain when I stop him. "Whoa, wait. Why would Weles put a pit here and then help us to cross it?"

Perun drops his hand. "You are right. He would not do this. Is trap. We pull chain, we go into pit with many snake."

"Exactly. And I bet it's a mechanical trapdoor too. It won't require magic to work."

Perun considers the space, looks at Orlaith, then says, "Maybe I make wind and we fly across?" Orlaith is of course the trouble; Perun and I could shape-shift to winged forms and fly across with ease.

"I have a better idea," I tell him. "Let's make a real bridge we can depend on." I contact Mecklenburg again and ask him to span the pit for us with an earthen bridge three feet wide. After a brief wait, it begins to form on either side of the pit, until it meets in the middle. Elementals are awesome.

Snake pit successfully navigated. Another corridor waits on the other side, bends a bit, and the throbbing of generators becomes much louder. When we reach the end of the corridor there's a floor-to-ceiling iron gate, easily managed and unlocked, and the reason for the generators becomes obvious: We are at the edge of a large cavern and there are a ridiculous number of UV lights mounted on the ceiling, shining down on a broad pasture of lush turf. It's the finest underground grazing land I've ever seen-also the only underground grazing land I've ever seen. All of it built to house and hide the warhorse of witowit, a beautiful white stallion who has spotted us and is prancing around on the far side, shaking his head in agitation and snorting.

"Wow," I breathe. "You don't see something like this every day." It's a lot of trouble for a single horse. But that wouldn't matter to Loki: Knowing the best day to start Ragnarok would be priceless information to him. I wonder if he asks the question daily, weekly, or if he only asks when he thinks something has changed in his favor. Even if he doesn't appear daily, those generators have to be switched out, the snakes have to be fed, and the stone stable over to one side has to be mucked out every so often. We shouldn't linger here. Somebody has to be visiting this place regularly, and I begin thinking defensively in case they visit soon. "Perun, let's get over there to the stable," I say. "That horse looks pretty upset, and we need it to calm down if we're going to get it out of here."

"How will stables help?"

"I don't want to set up our operation here, where someone can come in behind us."

"What operations?"

"A quick one. You'll see." We jog over to the stable, the warhorse watching us from the far side of the pasture, and I ask Orlaith to hide inside the stable.

If someone comes in to mess with us, you will be our surprise counterattack, I say, though I truly just want her to be safe. And I need you to guard my clothes and my staff, pretty please.

She agrees and I begin to disrobe. Perun politely turns his back and says, "I think I understand operations now. You will be speaking horse to horse."

"You got it on the first guess. Wait here, please." He nods and I shape-shift to a chestnut mare, which I must confess is my favorite animal form. Running is so effortless, and I love the feeling of my mane and tail whipping in the wind-not that there is any wind in this cavern. Just a nervous, twitchy stallion. I figure if I approach him as a horse, he won't feel immediately threatened and will let me get close enough to make contact and soothe him before he charges at me.

He keeps bucking as I grow closer, however. The sudden appearance of another horse is not as calming as I had hoped. He is a smart horse who knows how to count, and there had not been two horses in this cavern until this very moment. He knows something odd is going on.

Gods below, he's magnificent. Milk-white hide and a coal-black mane. I switch my vision to the magical spectrum, examine his turbulent aura, and find the threads of his consciousness. I reach out with my own, bind them together, and send him feelings of peace and harmony and my unabashed admiration for him. He rears back at first, pawing at the air with his hooves, but when he returns all four legs to the earth, he snorts once and grows still, open to hearing-or feeling, or seeing-more. I send him visions of the sky above Rgen and an invitation to go there with me. He nods his head, and I also feel his great desire to go. He hates it down here. No sky. No other horses. He has been so very lonely. I respond with happiness at his decision to accompany me and am about to tell him to follow, when movement tears my attention away from him.

Someone is coming through the gate that leads to our exit. He is like a stick of charcoal, dressed all in black and topped with a drape of black hair. Only his forehead, cheeks, and nose are pale; all else is darkness. He glances at me and the horse of witowit, dismisses us, and then he spies Perun by the stable. His hands curl into fists, his jaw juts forward, and his teeth are bared in a snarl; Perun does the same when he sees the man in black, who I suppose must be Weles. It's glaringly obvious that they hate each other.

Perun shouts a challenge at him and I expect to hear Russian, but it's something older, because these gods are much older than that language. But I do recognize the name witowit, and maybe a few others; Perun is most likely demanding to know where they are. I don't understand anything that Weles says in return. His voice is full of spite, though-he probably told Perun off in the rudest possible terms-and that looks like the end of diplomacy. What happens next is a bit comical: Perun lifts his axe and tries to summon lightning, but that's a nonstarter underground. Weles spreads his hands to either side, palms up, fingers clutching as if he's holding an invisible goblet in each, and raises them up in dramatic gesture. When there's no response to this, he blinks and looks down at the grass, bewildered that nothing has happened. No earth magic for him, no thunder for Perun. I'm thinking they're going to have to duke it out with good ol'-fashioned fisticuffs, but they surprise me and shape-shift instead. Perun tosses down his axe and takes wing as the biggest damn eagle I've ever seen, while Weles flops, twitches, stretches, and becomes a horror-show serpent, a truly gargantuan snake that could swallow me whole as a horse. Perun screeches and the snake hisses, and it makes me shudder.

I say, my mental voice slightly changed by my animal form, she says.

I recommend to the warhorse that he stay where he is, and then I circle around the edge of the pasture toward the stable. The serpent doesn't care: He only has eyes for Perun, who's circling above, gaining speed, and looking for an opportunity to dive. The snake coils itself to reduce the target area, forcing the eagle to go through the fangs if it wants to get to the body. It bobs and weaves its head, trying not to lose Perun in the glare of the UV lights, but considering the trouble I'm having keeping track of him, I imagine that it's difficult.

When I'm halfway to the stable, Perun attacks, and it's so fast that I can't track what happened exactly-just that the snake is bleeding and there are some feathers left behind afterward. No clear advantage to either.

At the entrance to the stable I change back to my human shape, so that my hooves won't clop loudly on the floor and draw the snake's attention. And as soon as I do, I think maybe I should be drawing the snake's attention, to give Perun a free shot. Putting most of my body behind the stable entrance, I simply peek my head out and shout, "Weles!"

The snake's head swings around and spies me. It rears back, and I scramble away from the door just as the massive head plunges through, breaking the frame with the power of its strike and snapping its jaws closed on air. And then just as quickly the head is gone, hissing as Perun takes advantage of my distraction and attacks from above.

Yes, I'm all right. But I need Scthmhaide. I see it resting next to my folded clothes and snatch it up, casting the binding that will turn me invisible.