Fortress of the Elder God
From Author Wars - https://authorwars.com/books/fortress-of-the-elder-god-1534286.html
Editions/Publications:
- Unknown. Fortress of the Elder God (Unknown, 天野喜孝, Dark Horse Books & Digital Manga Publishing, ISBN-10: 9781595829764, $10.99, 192 pages, Trade Paperback, Novel)