I think this is written in the manual, a different kind of ID. Yes it's something different and not possible in that plugin from what I see, even though the "displacement" filter relies on some kind of mask, since you need a "reference sprite" for the displacement, maybe this is why it's so troublesome to implement yet. You remind me about how amazing a mask system would be in MV, I had one in ACE and it was very powerful to simply use pictures to create very rich effects. Let's say for example a waterfall, it's one of the most effective way to create one, since you have to simply scroll a water texture sprite on a "reference greyscale" sprite at the right position above the player. I used that technic to create the fire in this video back when my game was on ACE: Well, now for this specific effect I'd rather go with this topic's plugin and a displacement filter to create the flames, if it becomes available in the list of filters, but it seems @Isabella Ava also has trouble to add it.