You can tap into the power of certain kinds of terrain to boost the power of your spells.
Prerequisite: Knowledge (nature) 1 rank.
Benefit: Select one of the following terrain types: cold (ice, glaciers, snow, and tundra), desert (sand and wastelands), forest (coniferous and deciduous), jungle, mountains (including hills), planes, planes (pick one other than Prime Material), swamp, underground (caves and dungeons), urban (buildings, streets, and sewers), or water (above and below the surface). Your terrain spells have +1 caster level and +1 to the save DC when cast in your chosen terrain. (If you have the favored terrain class feature, you gain this benefit in all of your favored terrains.) You do not gain multiple bonuses for casting a terrain spell in an area that qualifies for more than one of your terrains (such as forest and mountains).
A terrain spell uses up a spell slot one level higher than the spell’s actual level.
The Genius Guide To: Feats of Metamagic