Extreme Encounters: Weather and Terrain – Unearthly Omnibus (5e)

Create Dynamic Battlefields in Minutes

Transform ordinary travel, combat, and monster lairs into unforgettable, high-stakes encounters with Extreme Encounters: Weather and Terrain – Elemental Omnibus. This deluxe collection compiles five bestselling Extreme Encounters books into one essential volume:

• Acid – Acidic vapors, acid rain, corrosive and slippery slime for Aberrations and Oozes
• Necrotic – Blighted wilderness, cursed ground, unholy ground, necrotic curses and diseases (including a flesh-eating zombie virus)
• Poison – Mutant vermin infestation, poison rain, poison vapors, sewers, swamps, and even fighting in or around a rotting a Huge or Gargantuan monster carcass
• Radiant – Holy ground, solar ground, lunar ground, badlands, deserts, heat waves, sand dunes, and sandstorms (dust storms)
• Spirit – Astral and Ethereal crossroads, ghostly wailing (haunted areas), psychic dreamscape, and soul storm (magical extraplanar weather)

Enhance Any Encounter with Quick-Use Templates

• Magical and nonmagical environmental rules for realistic and fantasy hazards
• Monster and treasure ideas tailored to each environment
• Scalable danger levels, with terrain-themed abilities for hostile creatures
• Fast and easy templates to reduce prep time and enhance gameplay immersion

Expand Your Arsenal

• Perfect for GMs designing travel, exploration, or boss fight environments
• Great for quickly adjusting battlefields mid-session
• Works with any fantasy setting, whether homebrew or published worlds

Built for Serious Game Masters

MageGate Games creates premium, professionally edited books for serious GMs. Every product is professionally edited, extensively playtested, and designed for long-term campaign use.

Prefer print editions?

Extreme Encounters: Weather and Terrain Unearthly Omnibus

• Paperback available on Amazon US
• Hardcover available on Amazon US

Compatible with 5e

Compatible with both 2014 (5e) and 2024 (5.5e) rules.

Expand Your Collection

Check out our Extreme Encounters and Game Master’s Guide series for more GM tools and adventure-building content.

Get your copy now and bring the forces of nature into your 5E game!

Average Customer Rating

⭐⭐⭐⭐⭐

Awards

SILVER BESTSELLER

— Awarded by DriveThru RPG (DTRPG)

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Top Reviews

“This is part of a series where [MageGate Games] is covering different damage types, different terrain types, and really trying to give the DM or GM a reference series where they can say, ‘How can I make this environment around my characters a little different, make it a character almost ‘You’re in this place that’s doing all these other things to you AND you see this villain!’”

— Splinterverse (YouTube review of Extreme Encounters: Weather and Terrain: Spirit, included in the Omnibus)

“This is a great resource for any GM running a campaign and wants to add unique terrain features for the party to deal with. I own the entire MageGate collection and highly recommend them.”

— Pat, DTRPG review of Extreme Encounters: Weather and Terrain Unearthly Omnibus

“Another stellar text from the Mage Gate team. A worthy addition to any DM’s collection. It will make our inevitable trip to a level of Hell to retrieve a soul of one of our players that much more interesting (this does happen in everyone else’s campaigns, right?!)”

— Andrew, DTRPG review of Extreme Encounters: Weather and Terrain Unearthly Omnibus

"This book (and the rest of the Extreme Encounters series) gives a whole slew of great options for making combat more interesting. Plus, it's got fun bonuses like a new exhaustion system and explanations of how character abilities interact with the environments."

— Amazon review of Extreme Encounters: Weather and Terrain: Acid (included in this Omnibus)

"The new exhaustion rules seem balanced [and the book has] good ideas on magical terrain."

— Amazon review of Extreme Encounters: Weather and Terrain: Acid (included in this Omnibus)

"Acid is a very challenging terrain for players. I like the rules for constant damage [in this book] that can be increased or decreased as desired by the GM."

— DTRPG customer review of Extreme Encounters: Weather and Terrain: Acid (included in this Omnibus)

"As a DM who seems to attract very chaotic players, I'm always on the hunt for new and exciting ways to surprise them. This book offers a number of interesting (and, naturally, acidic) ways to do just that!"

— DTRPG customer review of Extreme Encounters: Weather and Terrain: Acid (included in this Omnibus)

"It's full of tasty bits to fill in around the edges of your game."

— DM's Guild customer review of Extreme Encounters: Weather and Terrain: Acid (included in this Omnibus)

"Interesting rules including unholy ground."

— DTRPG customer review of Extreme Encounters: Weather and Terrain: Necrotic (included in this Omnibus)

"The Necrotic book has some great terrains, creatures and magic items. It's a quick read. And these can be easily slid into any campaign. Great ideas and gets you thinking on how you can incorporate them in your game."

— Amazon customer review of Extreme Encounters: Weather and Terrain: Necrotic (included in this Omnibus)

"Interesting rules, including cramped sewer fighting."

— DTRPG customer review of Extreme Encounters: Weather and Terrain: Poison (included in this Omnibus)

"I like the balanced rules for heat waves. There are rules for Moonlit Ground [for celestials, fey, lycanthropes, etc.] which is something I have never thought of before when running a campaign."

— Amazon customer review of Extreme Encounters: Weather and Terrain: Radiant (included in this Omnibus)

"Interesting book with unusual [Astral and Ethereal] rules. I especially liked the Soulstorm rules."

— DTRPG customer review of Extreme Encounters: Weather and Terrain: Spirit (included in this Omnibus)

Preview interior pages below.

What to Buy Next:

• Legendary Lairs: Elemental Lairs (5e)

Why This Book?

• Legendary Lairs is the perfect complement to the Extreme Encounters series that inspired it.
• Boss fights built around evolving enemy behavior, adaptive tactics, and multi-stage encounters.
• Plug-and-play lair systems for Air, Cold, Earth, Fire, Lightning, Radiant, Thunder, and Water-themed adventures.
• Environmental hazards and battlefield effects that make terrain as dangerous as the monsters themselves.
• Ready-to-run boss mechanics that pair perfectly with the advanced monster abilities and combat options found in Traits and Actions.
• Tactical encounter design tools that help Game Masters create more cinematic and memorable battles with minimal prep.
• New lair actions, recharge actions, traps, magical terrain, and encounter complications for elemental campaigns.
• Perfect for dragons, elementals, cultists, primordial threats, magical disasters, and high-stakes dungeon encounters.
• Compatible with both the 2014 (5e) and 2024 (5.5e) rules.

or

• Legendary Lairs: Unearthly Lairs (5e)

Why This Book?

• Boss fights built around evolving enemy behavior, adaptive tactics, and multi-stage encounters.
• Plug-and-play lair systems for Acid, Disease, Necrotic, Poison, Psychic, and Shadow-themed adventures that expand on the weather and terrain in Unearthly Omnibus.
• Perfect for aberrations, assassins, dragons, cultists, fiends, hags, oozes, serpentfolk, undead, and high-stakes dungeon encounters.
• Compatible with both the 2014 (5e) and 2024 (5.5e) rules.