Stack Markers

[Rongway]

I think The Airy had the first stack markers I remember, unfortunately they used the orange marker used these day to indicate spreading out ... not the best design decision if you ask me ...

There are no stack mechanics in the Aery. You might be thinking of the vinegaroon boss in Sohm Al, which eats slimes and then attacks the party with either a red or blue indicator. The standardized orange stack marker is not used in this fight presumably because of the expectation that we notice the difference between the colored slimes and markers to decide whether to stack or spread; however, nowhere in the game do we ever have the standardized orange stack marker used to mean "don't stack".