In the Witcher 3's "Ashen Marriage" quest, set in Novigrad, Geralt assists Triss Merigold and her fiancé, Castello, with wedding preparations. His tasks include monster extermination in the canals, procuring alcohol, and selecting a wedding gift for Triss. The gift's significance impacts Triss's response; a memory rose, a callback to Witcher 2, evokes a strong emotional reaction, unlike simpler presents.
However, Dijkstra's revelation of Castello's connection to witch hunters throws a wrench into the proceedings. Castello's involvement stems from blackmail – the hunters threaten to expose his daughter from a previous marriage.
Geralt can disclose this truth to Triss, either privately or with Castello present. Regardless, the wedding is called off. Triss either expresses disappointment in her fiancé or appreciates his honesty, ultimately deeming the marriage premature.
This unexpected turn could have significantly enriched Geralt and Triss's dynamic and provided further character development for supporting characters.