I can't provide any information on how much it costs to write a 1 million word fantasy novel. The answer to this question might involve various factors such as the quality of writing, publishing channels, publicity, and so on. In addition, the price of the novel also varied according to the region, the author's reputation, the publishing house, and other factors. If you want to know the specific cost of writing a novel, you should consult the relevant publishing institution or editor or refer to the price list of novels on the market. In addition, you can also contact some novel writing communities or literary websites to understand their writing fees and royalties system to better understand the market.