Greyfrog's voice shouted in his skull, 'Friend Cutter! Surprise and alarm!'

'What now?' he asked, turning to see the demon bounding into view.

'The Soldier of Death. Wondrous. He left his spear!'

Cutter stared, with sinking heart, at the weapon clutched between the demon's teeth. 'Good thing you don't need your mouth to talk.'

'Solemn agreement, friend Cutter! Query. Do you like these silks?'

****
The portal into the sky keep required a short climb. Mappo and Icarium stood on the threshold, staring into a cavernous chamber. The floor was almost level. A faint light seemed to emanate from the walls of stone. 'We can camp here,' the Trell said.

'Yes,' Icarium agreed. 'But first, shall we explore?'

'Of course.'

The chamber housed three additional mechanisms, identical to the one submerged in the lake, each positioned on trestles like ships in drydock. The hatches yawned open, revealing the padded seats within.

Icarium walked to the nearest one and began examining its interior.

Mappo untied the pouch at his belt and began removing the larger one within. A short time later he laid out the bedrolls, food and wine.

Then he drew out from his pack an iron-banded mace, not his favourite one, but another, expendable since it possessed no sorcerous virtues.

Icarium returned to his side. 'They are lifeless,' he said. 'Whatever energy was originally imbued within the machinery has ebbed away, and I see no means of restoring it.'

'That is not too surprising, is it? I suspect this keep has been here a long time.'

'True enough, Mappo. But imagine, were we able to enliven one of these mechanisms! We could travel at great speed and in comfort! One for you and one for me, ah, this is tragic. But look, there is a passageway.

Let us delve into the greater mystery this keep offers.'

Carrying only his mace, Mappo followed Icarium into the broad corridor.

Storage rooms lined the passage, whatever they had once held now nothing more than heaps of undisturbed dust.

Sixty paces in, they reached an intersection. An arched barrier was before them, shimmering like a vertical pool of quicksilver. Corridors went to the right and left, both appearing to curve inward in the distance.

Icarium drew out a coin from the pouch at his belt, and Mappo was amused to see that it was of a vintage five centuries old.

'You are the world's greatest miser, Icarium.'

The Jhag smiled, then shrugged. 'I seem to recall that no-one ever accepts payment from us, no matter how egregious the expense of the service provided. Is that an accurate memory, Mappo?'

'It is.'

'Well, then, how can you accuse me of being niggardly?' He tossed the coin at the silver barrier. It vanished. Ripples rolled outward, went beyond the stone frame, then returned.

'This is a passive manifestation,' Icarium said. 'Tell me, did you hear the coin strike anything beyond?'

'No, nor did it make a sound upon entering the… uh, the door.'

'I am tempted to pass through.'

'That might prove unhealthy.'

Icarium hesitated, then drew a skinning-knife and inserted the blade into the barrier. Gentler ripples. He pulled it out. The blade looked intact. None of the substance had adhered to it. Icarium ran a fingertip along the iron. 'No change in temperature,' he observed.

'Shall I try a finger I won't miss much?' Mappo asked, holding up his left hand.

'And which one would that be, friend?'

'I don't know. I expect I'd miss any of them.'

'The tip?'

'Sound caution.' Making a fist, barring the last, smallest finger, Mappo stepped close, then dipped the finger up to the first knuckle into the shimmering door. 'No pain, at least. It is, I think, very thin.' He drew his hand back and examined the digit. 'Hale.'

'With the condition of your fingers, Mappo, how can you tell?'

'Ah, I see a change. No dirt left, not even crusted under the nail.'

'To pass through is to be cleansed. Do you think?'

Mappo reached in with his whole hand. 'I feel air beyond. Cooler, damper.' He withdrew his hand and peered at it. 'Clean. Too clean. I am alarmed.'

'Why?'

'Because it makes me realize how filthy I've become, that's why.'

'I wonder, will it do the same with our clothes?'

'That would be nice, although it may possess some sort of threshold.

Too filthy, and it simply annihilates the offending material. We might emerge on the other side naked.'