Wow really cool supplement! Very complete :
- Some lore geared towards table usability (love the procedure for generating a pelagic acolytes lair/temple);
- Two new classes that seem perfectly balanced (replacement dwarf and replacement thief);
- A d100 mutation table, 6 new monsters, 7 new items.
Haven't checked all the mutations, monsters and items for now. Dowloaded it for free at first to check it out, but now sending you the suggested price, if not only to encourage you, also because you included wonderful art which must not have been free :) .
I already had a project for an aquatic dungeon (for after 2025, probably, though) and maybe also will play Isle of the Plangent Mage in my campaign as a side quest for retainers, so I'll keep in touch if I use it and have feedbacks or if in 2026 I see a potential for a partnership.
Cheers :) !