From publisher blurb:
Create Monster Lairs in Minutes!
Enjoy quick, easy templates to spice up encounters, travel, and boss fights in a variety of weather and terrain. Previously released individually, this Elemental Omnibus collects five of our bestselling Extreme Encounters: Weather & Terrain books: Acid, Necrotic, Poison, Radiant, and Spirit.
Enjoy magical and nonmagical environment rules as well as monster and treasure ideas for:
Acid (including acidic liquids, vapors, and slime)
Necrotic (including blighted, cursed, and unholy ground)
Poison (including jungles, sewers, and swamps)
Radiant (including deserts, heatwaves, lunar, and holy ground)
Spirit (including astral, ethereal, haunted, and Great Old One induced nightmare terrain)
We also give you options to increase the threat level of our magical terrains, right down to granting hostile creatures in them limited spell lists or other fun terrain-themed abilities!