Just a BioWare Fan

In the universe of Dragaon Age, the Veil that separates the Fade from the rest of the world is not a physical thing, despite references to it being torn and breached. It's more a barrier, like that mages cast in battle, to be dispelled. Even its name implies a thin covering that hides rather than a solid wall.

Consider the codex entry on the Veil which can be found in all three games, giving it more heft as “the devs see the Veil this way and want the player to know it” than the mere conjectural nature of half-blind research would normally carry.

"Regardless, the act of passing through the Veil is much more about changing one's perceptions than a physical transition. The Veil is an idea, it is the act of transition itself, and it is only the fact that both living beings and spirits find the transition difficult that gives the Veil any credence as a physical barrier at all.”

It's a spell that Solas cast, expending vast amounts of power (as well it should require, considering the magnitude of its effects). We don't know the source of that power, whether it was inherent or drawn from people or amplified by his focus or all three. We do know that it had the effect of making everyone half-tranquil compared to the way the world used to be.

Fen’Harel, often a guest and a dear friend of Mythal, had arrived ashen and furious to sob at the edge of the well, pleading with her to return, to lead him to those that needed her judgment more than any elvhen ever had. Days had passed as the priests milled around the edges of the clearing, distraught and confused, but none had been brave enough to question a god to whom they were not pledged.

His grief had soothed them, somehow. Though everyone at the temple had felt the shock of her death none of them could tell for certain what had happened. Until the god had said it, had boldly stated their beloved Mythal was dead at the hands of another, the priests and sentinels had clung to the hope that she would return. As he had quieted, they had accepted the truth and begun to wonder what would become of them

After a week, Fen’Harel had exhausted the noisiest portion of his grief. He had knelt, slumped and silent, face buried in hands dripping tears, as the moon rose above the pool. The silhouette of a wolf at full howl with three ruby eyes gleaming in its head had been worked into the tail of his long tunic where it trailed between his heels. For a moment Abelas had expected the god to mimic this symbol