The easiest way to describe this system is “a mashup of D20 and Fate“. It’s not D20 elements converted to Fate Core, or Fate Accelerated, or even Fate Condensed, although it uses the latter. It’s also not D20 with aspects ham-handedly stapled on. You roll a d20 and add modifiers, like in D20. The results as compared to a ladder, like in Fate. Both Open Game Licenses and System Reference Documents are used for fill effect.
Like the hippogriff that I keep hammering as the central metaphor, though, the whole is more than the sum of its parts. The Hippogryph Codex is a decidedly unique creature. There’s the creativity and lofty ambition of the eagle, represented here as the DIY ethos and storygame approach of Fate. There’s also the stability and comfortable familiarity of the horse, which in this case is the comfortable, crunchy familiarity of D20.
I’m excited about this one. On some level I think it’s one of the best things I’ve ever worked on. It plays really smoothly, incorporating the strengths of both donor systems. You can easily create your own character classes, feats, and spells, or stick to the substantial list provided. It’s currently in the editing stage, so soon you’ll be able to see for yourself.