The 6.2 MSQ points us to a certain character who's from the Thirteenth, and has the ability to manipulate the aether of enemies by crystallizing them into "Memoria".

Now I know what you're thinking, isn't she a Reaper?
Whilst she wears a scythe like the reaper does, her armor suggests a hybrid class as the gear looks like a bard would wear but dyed black.

Just think of the class playable where we can transform our character into that of a voidling whether that transformation is a lesser voidling such as a flying eyeball or a greater voidling like an ascended angel (or whatever they're called in Fel Court of Troia).
One ability from the class is that we can turn our enemies into "Memoria" ourselves via the class ability bar that we get that fills up, then we unleash it's energy via other abilities.