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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
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 
or 
. Surfaces include Acid Surface or Ice Surface, and can also include spells such as 
. These areas can be examined in-game and will display as a Surface.
Examples of surfaces are: Ice, Acid and Grease
Cloud
An area that exists as a cloud above the floor. They can be blown away with 
. These areas can be examined in-game and will display as a Cloud.
Examples of clouds are: 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 | Can be found on |
|---|---|---|---|
| None | |||
| Ignite | Explodes the area or sets it on fire. | Can explode Smokepowder and turn multiple surfaces into Fire. | 
|
| Douse | Extinguishes fire | Can remove Fire | 
|
| Electrify | Makes the surface electric. | Can turn Water into Electrified Water. | 
|
| Deelectrify | |||
| Freeze | Freezes the area. | Can turn Water to Ice. |
|
| Melt | Melt a surface. | Can turn Ice to Water. |
|
| Vaporize | Vaporizes a surface. | ||
| Condense | |||
| DestroyWater | Destroys water | Removes Water | 
|
| Clear | |||
| Daylight | 
| ||
| TurnHellfire | |||
| UnturnHellfire |