" Like in every other aspect of life, when summoning ideas for fantasy role-playing games, there is always room for new original ideas and pushing of the boundaries of your very own monster inventory."
Monsters are like patato chips one can't have enough & in this case its question of adding in an original monster book with a difference. That difference is two strains of mythology & a bit of Cryptid goodness to add to your OSR or old school campaigns.
The Bestiary of Cryptofauna is one of those monster books that comes out of nowhere squared to sting you between the eyes. Hannah Saunders isn't an artist or writer that I'm too familiar with but Stellagama Publishing is one of my all time favorite Cepheus Engine rpg publishers. So when The Bestiary of Cryptofauna appeared in my email maybe it was time to take a quick look & its a nice little selection of monsters for B/X Dungeons & Dragons game or an OSR retroclone. This book clocks in at forty six pages with all of the monsters illustrated. The monsters have been created with BX Essentials in mind but could easily port over to Advanced Dungeons & Dragons first edition. Here's a good example with the plastic elemental;
Armor Class: -2
Hit Dice: 16 (72hp)
Attack: 1x blow (3d6)
Movement: 60’ (20’) in solid form or 180’ (60’) in oil form on water
Saving Throws: D2, W2, P2, B2, S4 (16)
Number Appearing: 1(1)
Oil elementals resemble either headless, plastic humanoid figures with hands and feet resembling modern-day plastic play-bricks, or liquid oil stains which form waves that crash on any creature attacked, only to reform in the next round. In their solid form, plastic elementals can cross a body of water at a speed of 15’ while floating, and in their liquid form at a speed of 60’. Oil elementals are evil by nature and often serve as henchmen for malignant warlocks and monarchs. They also bear hatred towards marine creatures such as whales, seals and sea turtles, as well as fish.
• Flammable: Oil elementals take double damage when attacked by fire (including fire elementals) in both forms. This will set them on fire, causing them 1d8 damage per round of burning, but increasing their damage by 2d6 per attack.
• Oil over water: Oil elementals cause an additional 1d6 damage when in oil form against creatures in water."
So overall this a forty six page creature catalog with a very overall flow of monsters for old school campaigns. I can see adding these into any Mystara campaign with little difficulty and there's some really well thought out original monsters. You wanna add a monsters that the players are not familiar with into your Mystara adventures then this is the book to use.