Ultimate Eberron is more or less where I stock up all my notes on a Pathfinder conversion for Eberron. However, it has since evolved into some sort of reboot (the name “Ultimate Eberron” is a refference to the “Ultimate Marvel” universe).
Ultimate Eberron use the 3.5 Eberron Campaing Setting book as its basis. However, instead of converting all the Eberron material to Pathfinder, it does the opposite: converting all the Pathfinder material to Eberron. Ultimate Eberron can be considered a “what if”, in this case a “What if Eberron had used Pathfinder as its basis”.
- Hero Points (Advanced Player Guide)