ChatGPT 4o and 4o-mini with Search were able to answer this question without any issues. Maybe you didn't enable the search functionality? --------------- 4o:

ChatGPT 4o and 4o-mini with Search were able to answer this question without any issues. Maybe you didn't enable the search functionality? --------------- 4o: Yes, Paul Edwin Zimmer wrote a fourth novel in his Dark Border series titled Ingulf the Mad, published in 1989. This installment focuses on the characters Ingulf Mac Fingold and Carrol Mac Lir, detailing their meeting and acquisition of mystical swords. Notably, Istvan Divega, the protagonist of the earlier books, does not appear in this novel. --------------- 4o-mini: Yes, Paul Edwin Zimmer authored a fourth novel in his Dark Border series titled Ingulf the Mad. Published in 1989, this book shifts focus from the previous protagonist, Istvan DiVega, to explore the backstory of Ingulf Mac Fingold and Carrol Mac Lir, detailing their initial meeting and the acquisition of their mystical swords. The complete Dark Border series consists of four novels: 1. The Lost Prince (1982) 2. King Chondos' Ride (1983) 3. A Gathering of Heroes (1987) 4. Ingulf the Mad (1989) These works delve into a world where the Hasturs' power is crucial in containing dark creatures, and the narrative unfolds through various characters' perspectives.