Areas

An Area describes a space that has special effects on creatures that enter it. They can be generated by Items, Spells, or creature actions. Areas have properties that describe them.

Area types

There are different types of areas, which have different properties and interactions.

Surface

Main article: Surfaces

An area that exists as a flat layer on the floor. The effects of surfaces can be avoided by flying over them with things like  Fly or  Tempestuous Magic: Flight. Surfaces include  Acid surface or  Ice surface, and can also include spells such as  Web. These areas can be examined in-game and will display as a Surface.

Examples of surfaces are:

•  Acid
•  Fire
•  Grease

Cloud

Main article: Clouds

An area that exists as a cloud above the floor. They can be blown away with  Gust of Wind. These areas can be examined in-game and will display as a Cloud.

Examples of clouds are:

•  Cloudkill
•  Fog

Summoned

Areas that show up in the combat log as being summoned. Summoned areas generally work by applying a condition to creatures that enter them. Summoned areas can be placed on top of each other, but cannot stack with identical areas as a creature can only have one instance of the applied conditions at a time. These areas cannot be examined in-game, but may have a condition representing them found on their source spell different from the one applied when entering.

Examples of summoned areas are:

•  Hunger of Hadar.

Area interactions

There are multiple types of interactions found in-game that can alter areas. These are found as the SurfaceChange() function. Not all interactions work with all surfaces, see "Interactions" on an area page to see what it interacts with and how.

These values are from ValueLists.txt:

Value	Description	Example	Derived from
None
Clear
Condense
CreateWater	Extinguishes fire	Can remove Fire	Create Water
Daylight			Daylight
Deelectrify
DestroyWater	Destroys water	Removes Water	Destroy Water
Douse	Extinguishes fire	Can remove Fire	Ray of Frost
Electrify	Makes the surface electric	Can turn Water into Electrified Water	Shocking Grasp
Freeze	Freezes the area	Can turn Water to Ice	Ray of Frost
Ignite	Explodes the area or sets it on fire	Can explode Smokepowder and turn multiple surfaces into Fire	Fireball,  Fire Bolt
Melt	Melt a surface	Can turn Ice to Water	Fireball,  Fire Bolt
TurnHellfire			Hellfire Exhaust,  Hellfire Missiles,  Igniting Spark,  Diabolic Chains,  Ravaging Inferno
UnturnHellfire
Vaporize	Vaporizes a surface