Buoyancy (Ex): Upon entering this class, you become buoyant in water, giving you a +4 circumstance bonus on Swim checks. Additionally, your armor has been blessed by a cleric of Tem-Et-Nu, which means the armor check penalty for your armor is reduced by half. If you ever lose your armor, or if you want a new suit blessed, a cleric of Tem-Et-Nu can perform the ceremony to bless your armor at any temple devoted to your patron deity. The blessing is free of charge for scions.
[Changed the text from "which means the armor check penalty for your armor is not doubled for the purposes of Swim checks.". Seeing as how the original ruling is lost in the conversion process unless the rule is kept in a homebrewed game.]
Also the flashflood spell since the prestige class directly references it. The spell itself is very wordy but nothing out of the ordinary to allow it to become part of pathfinder.
Otherwise the prestige class is easily shiftable to pathfinder.