As he touches it, his vision splits into three, overlaid atop each other but somehow perfectly comprehensible despite this.
An aeon descends to the material plane. A transgression is about to happen here, a violation of the cosmic laws that keep the planes in balance. It has been tasked with stopping this. Through the aeon's eyes, every demon's presence at the festival in Kenabres is impermissible, not because of the slaughter they wrought (seen through these eyes, it barely seems relevant; of course if a babau puts a spear through someone's chest, the predictable consequence is that that person will die) but because of their contravention of the laws that govern the planes. Deskari's presence brings a sense of utter wrongness, a gash cut through a canvas, a scream in the middle of a symphony.
It is the aeon's task to stop it.
But Deskari swings his scythe, and just as it claims Terendelev, so too does it claim the aeon. The fragments of its soul linger, and it is those fragments that now grant Blai a tiny piece of its sight.
An aeon looks through Blai's eyes. There are demons in that building, and there should not be. But more importantly, there is a crystal on the ground, in the shape of a knife, and that transgression is as uncomfortable as Deskari's presence at the festival. Insofar as the aeon can be said to have human emotions, it wants to purge this knife from existence, send it back from whence it came.
On the edges of Blai's vision, there is something extraplanar about Seelah, and likewise about Woljif, but those presences bring no discomfort to the aeon, for in both cases they are bound by the laws that govern such matters. But there is a quality about Blai that it finds uncomfortable, woven into his soul, one which the aeon has never before seen and does not recognize.
An aeon dissipates, its task done. The wound in the world is healed, the countless transgressions of both sides in this war are eradicated, and everything is within its rightful place.
The visions fade, leaving only the fragments of the aeon's soul. They are already beginning to disperse, but there is a place in his soul that could hold one, that could retain some tiny fraction of the aeon's power, permitting it to lie dormant until it can carry out its purpose.