"A fantasy d20-themed dungeon crawler", to quote DarkGod's comment. Inspired by Incursion by Julian Mensch. Made available under Open Game License. This is a non-profit fan project. No money is made. There are currently only two people working on the mod. However, we have released several beta versions so far.
Normal scorpions and spiders were replaced by their less dangerous tutorial version. Their numbers were also reduced and some of the water was replaced by the shallow water, making players less likely to drown when getting across the lakes.