‘No. Bhelliom will know what you’re telling it to do. Now, remember the inside of the cave – the look of it, the feel, and even the smell. Then imagine the roof collapsing. The rocks will tumble down and bounce and roll and pile up on top of each other. There’ll be a lot of noise. A great cloud of dust and a strong wind will come rushing out of the cave mouth. The ridge-line above the cave will sag as the roof of the cavern collapses, and there’ll probably be avalanches. Don’t let any of that distract you. Keep the images firmly in your mind.’

‘It’s a bit more complicated than an ordinary spell, isn’t it?’

‘Yes. This is not, strictly speaking, a spell, though. You’ll be unleashing elemental magic. Concentrate, Sparhawk. The more detailed you make the image, the more powerfully Bhelliom will respond. When you’ve got it firmly in your mind, tell the jewel to make it happen.’

‘Do I have to speak to it in Ghwerig’s language?’

‘I’m not sure. Try Elene first. If that doesn’t work, we’ll fall back on Troll.’

Sparhawk remembered the mouth of the cave, the antechamber just inside, and the long, spiralling gallery leading down to Ghwerig’s treasure-cave. ‘Should I bring down the roof on that waterfall as well?’ he asked.

‘I don’t think so. That river might come to the surface again somewhere downstream. If you dam it up, someone might notice that it’s not running any more and start investigating. Besides, that particular cavern is very special, isn’t it?’

‘Yes, it is.’

‘Let’s enclose it then and protect it forever.’

Sparhawk pictured the ceiling of the cave collapsing with a huge, grinding roar and a billowing cloud of rock dust. ‘What do I say?’ he asked.

‘Call it “Blue-Rose”. That’s what Ghwerig called it. It might recognize the name.’

‘Blue-Rose,’ Sparhawk said in a tone of command, ‘make the cave fall in.’

The Sapphire Rose went very dark, and angry red flashes appeared deep in its centre.

‘It’s fighting you,’ Sephrenia said. ‘This is the part I warned you about. The cave is the place where it was born, and it doesn’t want to destroy it. Force it, Sparhawk.’

‘Do it, Blue-Rose!’ Sparhawk barked, bending every ounce of his will on the jewel in his hands. Then he felt a surge of incredible power, and the sapphire seemed to throb in his hands. He felt a sudden wild exaltation as he unloosed the might of the stone. It was far beyond mere satisfaction. It verged almost on physical ecstasy.