Miranda was furious.
Not her typical mild irritation, but full-blown anger.
Shattering the Universe's barrier was her way of venting it.
The reason? She had uncovered a scheme orchestrated by the giants. More specifically, it was the doing of one particular giant—Eldros, the one currently serving his tenure as the Master of the Zanerth universe.
Miranda recalled Malecor approaching her some time ago with a warning about Eldros' plans (Chapter 212).
At the time, she had dismissed it entirely as her brain was too preoccupied with thoughts of Jamie to focus on anything else.
But now, with a giant as talented and fortunate as Vaelon—one who had achieved Higher Dimensionality even before entering the Cosmic Realms—getting involved, ignoring the situation was no longer an option.
To put it plainly, Eldros' scheme revolved around seizing control of territories belonging to Estea and the Argent Empire.