I have no idea how this had been done, would like to have that in my games cutscenes… Using sequence.
My FX skill? Low level. Like very…
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I just dig in Google and found this… But link is very out of dated and I want to learn that and maybe I able to do it myself.
Another good character dissolve effect is the Reaper character in Overwatch. When moving as wraith form, and when teleporting, it does a character dissolve that looks a lot crisper than that movie.
So, for this movie, I would expect to start with opaque smoke, not drawing the character, then start drawing the character with hard focus blur while there still is a lot of smoke, and then fade out the focus blur as the smoke clears.
For the Overwatch Wraith character, I would probably try to render the character to a separate texture, then use a warping-and-dissolving shader to place that texture as a billboard in the scene. (This could even be done with Z/depth billboards, if you have the performance budget.)
Billboard! Of course!
I forgot about history of games. Yeah I can do this with after effect 
combined with unreal engine effect.