Sigismund Dijkstra was an advisor to King Vizimir II.
Sending a Spy to Cintra
Dijkstra came to King Vizimir's rescue, killing two of his advisors, who were attempting to kill him, stabbing one in the throat and poisoning the other. He then revealed to the king that the Northern Kingdoms had formed an alliance based on their mutual hatred of elves, but that was no concern of theirs. With Calanthe gone, Dijkstra believed the time had come to make a play for Cintra.
Meeting with the Brotherhood
Dijkstra informed the Brotherhood that an elven baby had been born of a mage. Artorius and Stregobor saw this as a potential threat, who were already aligned with Nilfgaard. However, Tissaia and Vilgefortz didn't intend to act on unfounded prejudice and rumor. Dijkstra replied that today's gossip was next month's news. For instance, he'd heard that Triss had returned, which the council was not aware of.
King Vizimir and Dijkstra discussed their next move. Ciri would give them the rightful claim to Cintra, making Redania the most powerful kingdom on the Continent. Unfortunately, unknown variables remained at Aretuza. But even without Dara, they remained in a strong position.