Extreme Encounters Omnibus Complete Collection (5e)

The Extreme Encounters Omnibus Complete Collection combines both Extreme Encounters: Weather and Terrain Omnibuses to create a complete modular encounter toolkit for Game Masters who want more cinematic boss fights, dangerous environments, evolving battlefields, and low-prep tactical encounters.

Together, these books transform ordinary encounters into memorable set pieces filled with environmental hazards, magical and nonmagical terrain systems, weather effects, traps, and battlefield complications.

Save 25% on the complete Extreme Encounters collection.

Get both omnibuses and save $10 compared to purchasing separately.

Designed for fast integration into existing campaigns, these plug-and-play systems work equally well for dungeon crawls, wilderness adventures, elemental campaigns, dark fantasy settings, planar expeditions, and high-stakes boss encounters.

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

Preview of interior pages below.

What You’ll Get

• Extreme Encounters: Weather and Terrain Elemental Omnibus (5e)

Dozens of weather effects, environmental hazards, magical terrain systems, monsters, and encounter complications for elemental or adverse weather adventures.

• Air – Magical cloud castle terrain, high elevation areas (including altitude sickness rules), lightning storms, thunderstorms, tornados, windstorms
• Cold – Magical cold terrain, blizzards, frozen lakes/rivers, hailstorms, snowstorms, thundersnow/sleet, winter storms, plus how winter weather impacts travel times
• Earth – Magical Elemental/Fey chaos, caves, chasm/cliffs, earthquakes, forests, hills/mountains, mines (with elevator and deadly gas rules), mud/clay, and quarries
• Fire – Magical fire terrain, burning buildings, fire devils (fire tornados), firestorms, lava flow, lava tubes, volcanic eruptions, and wildfires
• Water – Magical Fog Banks, beaches (rocks or sand), coastal sand dunes/sinkholes, floods (with waterborne disease rules), rain (light or heavy), rapids, river crossings (with or without a ferry), rough sea voyages (ship in storm rules), and waterfalls

The Elemental Omnibus collects these five Extreme Encounters: Weather and Terrain titles:

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

Dozens more weather effects, environmental hazards, magical terrain systems, monsters, and encounter complications for supernatural or adverse weather adventures.

• 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)

The Unearthly Omnibus collects these five Extreme Encounters: Weather and Terrain titles:

Between both omnibuses, you get:

• Hundreds of modular encounter combinations for dungeon crawls, wilderness adventures, boss fights, and campaign-scale encounter design.

• Systems designed for low-prep Game Masters who want faster setup and more memorable encounters.

Why Game Masters Recommend Extreme Encounters: Weather & Terrain

• Transform ordinary locations into memorable cinematic set pieces.
• Drop modular weather and terrain systems into almost any campaign with minimal prep.
• Add dynamic environmental hazards, evolving battlefields, and meaningful tactical choices.
• Flexible templates adapt to wilderness journeys, dungeons, cities, boss fights, and exploration.
• Designed for long-term campaign support—not disposable filler.

Average Customer Rating Across Both Books in Bundle

⭐⭐⭐⭐⭐ (5/5 stars)

Awards

SILVER BESTSELLERS

Awarded by DriveThru RPG (DTRPG)

Top Reviews

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR ELEMENTAL OMNIBUS — Amazon customer

"Too often weather is neglected as an element of TTRPGs, perhaps because it’s too daunting to come up with all the mechanics, but here MageGate has done it for you. Super charge your games with this omnibus, loaded with conditions, effects, and everything else you’ll need to imperil your players in new and exciting ways."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR ELEMENTAL OMNIBUS — Splinterverse (YouTube Channel)

"Don’t just say ‘You’re walking through the forest.’ There can be so many other ways to bring the space to life! And once you do that [with this Elemental Omnibus] that could lead to some really cool storytelling. I really like this book for the flexibility of the options… really, really fun!"



⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR ELEMENTAL OMNIBUS — Amazon customer

"This book has a lot of great information for any DM who's running an elemental campaign."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR ELEMENTAL OMNIBUS — Amazon customer

"In a good D&D campaign, the scenery isn't just to look at. It's to navigate, do battle with, and use to your advantage. Extreme Encounters gives you a huge number of tools to develop fun landscapes."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR ELEMENTAL OMNIBUS

"Once again, MageGate has produced an invaluable resource for DMs. As well as rules for inserting magical or extreme terrain into your adventures, they also suggest magical items which might go with the area."

— DTRPG customer, review for Extreme Encounters: Weather and Terrain Elemental Omnibus

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR ELEMENTAL OMNIBUS — Amazon customer

"Extreme Encounters: Weather & Terrain Elemental Omnibus: This book has a lot of great information for any DM who's running an elemental campaign."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR UNEARTHLY OMNIBUS — Pat, DTRPG customer

"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."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR UNEARTHLY OMNIBUS — Andrew, DTRPG customer

"Another stellar text from the Mage Gate team. A worthy addition to any DM's collection."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR ACID (included in UNEARTHLY OMNIBUS) — Amazon customer

"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."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR ACID (included in UNEARTHLY OMNIBUS) — Amazon customer

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

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR ACID (included in UNEARTHLY OMNIBUS) — DTRPG customer

"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."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR ACID (included in UNEARTHLY OMNIBUS) — DTRPG customer review

"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!"

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR ACID (included in UNEARTHLY OMNIBUS) — DM's Guild customer

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

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR AIR (included in ELEMENTAL OMNIBUS) — Amazon customer

"Good information on weather events including tornados. I recommend this book for anyone planning on a sky-based campaign."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR AIR (included in ELEMENTAL OMNIBUS) — Amazon Japan customer

"I was looking for some inspiration for encounters when [players are] flying around, and this provided a variety of different ideas and weather conditions. There were also a number of new and interesting [air and storm-related] magical items, which was very nice. Highly recommended!"

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR AIR (included in ELEMENTAL OMNIBUS) — DTRPG customer

"Good information. Finally some rules for Cloud Castles!"

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR COLD (included in ELEMENTAL OMNIBUS) — Amazon customer

"I am currently writing a winter-themed campaign for my DND 5e group [and] this book is going to help me a lot in my upcoming campaign. Definitely recommend."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR COLD (included in ELEMENTAL OMNIBUS) — DTRPG customer

"Cold weather campaign? This book has you covered. I do recommend this book for any GM running an Arctic Adventure."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR FIRE (included in ELEMENTAL OMNIBUS) — DTRPG customer

"Good rules for burning buildings and handling lava flows."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR EARTH (included in ELEMENTAL OMNIBUS) — DTRPG customer

"Good book with some uncommon rules... fighting in narrow passages and on slopes are a must when actually running a group through a cave crawl."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR EARTH (included in ELEMENTAL OMNIBUS) — Jessalyn S., Amazon customer

"I got a lot of cool adventure ideas from this book! It has great easy rules for running adventures in caves, hills, mountains, forests and mines. This book as well as the others will always find use at my table!!!"

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR NECROTIC (included in UNEARTHLY OMNIBUS) — DTRPG customer

"Interesting rules including unholy ground."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR NECROTIC (included in UNEARTHLY OMNIBUS) — Amazon customer

"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."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR POISON (included in UNEARTHLY OMNIBUS) — DTRPG customer

"Interesting rules, including cramped sewer fighting."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR RADIANT (included in UNEARTHLY OMNIBUS) — Amazon customer

"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."

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR SPIRIT (included in UNEARTHLY OMNIBUS) — DTRPG customer

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

⭐⭐⭐⭐⭐ VERIFIED REVIEW FOR WATER (included in ELEMENTAL OMNIBUS) — DTRPG customer

"It's good to see common sense rules for flooding, including waterborne disease."

Prefer print editions?

Extreme Encounters: Weather and Terrain Elemental Omnibus

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

Extreme Encounters: Weather and Terrain Unearthly Omnibus

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