What if certain bosses had the oppositeof an enragetimer?

[Neophyte]

As already said, there are a few fights were you have to slow down your dps on a specific target (mostly main boss) to get mechanics done, which would wipe you instead.
Like Ifrit, Leviathan, Mogry King, Ramuh... also if you burn Odin in a specific time you can get Gungnir right before Shin-Zantetsuken, but I'm not sure if that can wipe you.

There're also moves like "Heatwave" from the 5-headed dragon in CT3.
Under effect of this debuff you'll get 500 damage for every action for idk.. 5 seconds?
Can be prevented like T10-preys with shields/SS, however it's not only affecting two players but the whole group.


They could also give bosses changing vulnerabilites (physical / non-physical) like in T13, while the players who are affected by the current buff have to deal with adds or some button/tile-mechanic (maybe like @ Atomos in CT1).