Mental exercise: create/change mechanics

[Local_Custard]

I don't remember exactly how it works, however, Allagan Rot from T2 is the first thing that sprang to mind.

To add something else to the discussion, something I have mentioned in the past is stuns/interrupts being useful, but not in the way that they stop an attack, but they change properties of it. As an example, a raidwide does massive damage, but, if you stun it, 50% of the damage goes out as normal and the last 50% goes out as a DoT over, say, 15 seconds. Whether something like this could be coded in the current engine is unknown, but it would shake up the dynamics of a fight, especially if you had different effects based on stuns or interrupts.

For this hypothetical, let's say the mechanics aren't limited by code or at least the code can accommodate it-

I would love if stun had more uses- too often I find myself itching to use it and finding it does nothing. I love interrupt. It's a skill I miss having when not playing bard, machinist, or gunbreaker. Sometimes I think whenever I play redmage: "man I would love if redmage had interrupt" (disclaimer: I have no idea if interrupt would be good or bad for redmage)
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Found it! It was turn 2 coils

https://youtu.be/mqP2ooPB9ys?si=II1Ni7B7uTFajXXy

watched into this video and yeah it is similar, though the version of debuff I wrote is less about juggling who does and does not get it and more about curing as soon it reaches a certain point. Though, in essence it is the same- a debuff that acts like a disease. Thanks for linking the video!