He was, or seemed to be, a renegade priest of Phos who had gone over to the dark god Skotos and thus prolonged his own wicked life more than two centuries beyond its natural terms. With help from Zaidas, among others, Videssian forces had vanquished the Halogai that Harvas led at Pliskavos in Kubrat; his own power was brought to nothing there. But he had not been taken, alive or dead.

"What precisely do you wish me to do, your Majesty?" Zaidas asked.

"You head the Sorcerers' Collegium these days, my friend, and you were always sensitive to Harvas' style of magic. If anyone can tell through sorcery whether Harvas is the one behind these Thanasioi, I expect you're the man. Is such a thing possible, what with the little we have to go on here?" Krispos tapped Taronites' letter with a forefinger.

"An interesting question." Zaidas looked through rather than at Krispos as he considered. At last he said, "Perhaps it may be done, your Majesty, though the sorcery required will be most delicate. A basic magical principle is the law of similarity, which is to say, like causes yield like effects. Most effective in this case, I believe, would be an inversion of the law in an effort to determine whether like effects—the disruption and devastation of the Empire now and from Harvas' past depredations—spring from like causes."

"You know your business best," Krispos said. He'd never tried to learn magical theory himself; what mattered to him were the results he might attain through sorcery.

Zaidas, however, kept right on explaining, perhaps to fix his ideas in his own mind. "The law of contagion might also prove relevant. If Harvas was in physical contact with any of these Thanasioi who then came into contact with the priest Taronites, directly or indirectly, such a trace might appear on the parchment here. Under normal circumstances, two or three intermediate contacts would blur the originator beyond hope of detection. Such was Harvas' power, however, and such was our comprehension of the nature of that power, that it ought to be detectable at several more removes."