Tank in Leviathan EX

[Atreides]

Dreadwash is not unstunnable per se.
The add just happens to build a stun resistence really quick while not stunned, after a while he just becomes immune to it which it usually is by the time it casts Dreadwash.
We usually stunlock it and never have trouble. We start it like 5 seconds after it spawns, then just stun again 2 secs after it wears off, by the time the 3rd is done the add dies without getting anything off.
If something goes wrong you can always have a summoner or white mage knock the add away to interrupt his cast.
I'm well above 70 kills now and so far it always worked. The mirror has yet to drop...

[Crimson-Falcon]

Dreadwash is not unstunnable per se.
The add just happens to build a stun resistence really quick while not stunned, after a while he just becomes immune to it which it usually is by the time it casts Dreadwash.
We usually stunlock it and never have trouble. We start it like 5 seconds after it spawns, then just stun again 2 secs after it wears off, by the time the 3rd is done the add dies without getting anything off.
If something goes wrong you can always have a summoner or white mage knock the add away to interrupt his cast.
I'm well above 70 kills now and so far it always worked. The mirror has yet to drop...

of course thats what i do

the add follow a certain rotation before it cast dreadwash

Ruin -> Ruin -> Darkness ( not always so sometimes it skip it ) -> dreadwash

so the best bet is to stun it after the 2nd ruin to give your team as much time as you can before stuns wear off