The Siren of Inkstvarr is the monthly monster for February. It's a sea serpent haunting the waters around the island of Inkstvarr, which is where Valkolov the Mind-Wizard currently lives.
Both Dungeon World and Labyrinth Lord versions are contained in a single pdf.
This one is a bit short because it's a short month and we've been doing some other secret project work that I will share with patrons soon.