Monster art by Robin Gibson (metalsnail.net)

18 monsters available for pay-what-you-want on itch.io, all under the same Creative Commons Attribution licence.

I have just posted a sample here because I don't want to interfere with Robin's sales.

Bandit Siren:
Sirens are well-known for their ability to draw sailors off course, running their ships aground. For most Sirens, this is simply accidental. This sea dweller has developed a taste for gold, using her special skills to become the third most feared pirate in the ocean.

Corrupted Seraphim:
The Paladins of the Northern Mountains build these devices to keep the land safe from monsters and demons. Unfortunately they turned out to be incredibly susceptible to Biomech Blight, giving them both a curse of flesh, and a monster soul.

Splash Elemental:
When asked "Don't you mean 'Water Elemental'?" a Splash Elemental will launch a cup of water at your face and fly off. like Toast Elementals, these fairies are common in Kitchens around the world, primarily as dishwashers.