Help wanted: Sundering Doom and Doomed Sundering WA

[Dastey]

Hello everyone, I am hoping someone here has the knowledge of WA to help with a WA.
On the Desolate Host in ToS the boss under 30% will cast a Doomed Sundering and Sundering Doom where you will either have to run away or stack up close to boss depending on which realm you are in.

Due to the names being really similar I would like to make a WA for our entire raid.
The WA needs to only be enabled when on Desolate Host and otherwise it needs to check if you are in Spirit Realm or Corporeal Realm. I believe but not certain that the debuff tied to this is http://ptr.wowhead.com/spell=235621/spirit-realm

After this it needs to check when the boss casts either Sundering Doom or Doomed Sundering and give a message depending on these:
If Spirit Realm and boss casts Sundering Doom give a Red Arrow that points down and says RUN AWAY
If Spirit Realm and Doomed Sundering give a green arrow that points up says STACK UP
If Corporeal Realm and boss casts Sundering Doom give a Green Arrow that points up and says STACK UP
If Corporeal Realm and boss casts Doomed Sundering give a red arrow that points down and says RUN AWAY.

Is there anyone that can help with this?
Thanks in advance

- - - Updated - - -

I'm fairly certain I got a working WA for the Spirit Realm, however since there is no debuff for the Corporeal Realm I can't quite seem to think of a way to make it show when you have no debuff but hide when you have the debuff

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