/vr/ - Retro Games

This is what I'm trying to do and can't figure out, anybody able to help me on this?

The player goes up the stairs and at each landing (where there's an imp) the acid rises up to that landing, damaging everything it touches including the imps. The big sector to the left is the acid's sector. I've removed all my previous linedef/script attempts for clarity.

Link:
https://my.mixtape.moe/ztngcg.wad

So this is what I'm trying to do (and am failing at):

It's a 3d staircase rising around the room, I'm trying to create a script that uses the big unreachable sector to the left full of acid, to "rise" through the entire room and damage everything, imp's included, but the room is visibly full of acid as you can swim around in it and whatever else.
I've deleted my former attempts so there's no garbage cluttering up the interface, but it's doing my head in because I know it's actually pretty easy to do but I couldn't write code if you put a gun to my head.
One option I hadn't tried yet was having the large acid sector be underneath the main area and it "rise" from there.

Link:
https://my.mixtape.moe/mxhncp.wad