Environment Book Series

The Environment series were a series of splatbooks for Dungeons & Dragons 3rd Edition that focused on different types of environment.

Frostburn

Frostburn focuses on taiga and tundra environments as well as supernaturally cold planes. On the crunch side, it adds a bunch of ice themed abilities.

Mechanically it is notorious for introducing the Shivering Touch spell, which does 3d6 (~10.5) points of dexterity damage that stacks with itself for a third level spell. This spell is absolutely bonkers since enemies rarely have that high a dexterity score, and even ones that do will rarely survive multiple hits from it.

Sandscape

Sandscape focuses on badlands, desert, and wastelands. Unlike Frostburn, there's not that much fire or extraplanar material.