[Scripting Question] New Terrain effect

[Reiwu]

(like grassy, misty etc) terrain
I would like too add a new terrain effect
With properties like desolate land (aka changes on user swich in and out)
i couldn't find any information or tutorials so I might as well ask

 

[mgriffin]

Have you looked at how Desolate Land works? What parts don't you understand?

 

[Reiwu]

Have you looked at how Desolate Land works? What parts don't you understand?

All I know so far is that this is what ends it
https://prnt.sc/qcsvn9

That and I know how it starts and stops water from worki- basically i know the fundamentals of that move