With Vivrum making her move, there really wasn't a single thing that the Elven King could do.
Especially since he and his high elves had been completely beaten up to the point where they couldn't even move.
As strong as the Elven King and the high elves were, it wasn't as if they could do anything when they were completely drained and injured like this. At the same time, it wasn't as if Vivrum and the High Priestess would just leave them with the abilities to cause any trouble.
With the powers of Vivrum, there was a seed that was implanted in them that drained them of their mana which effectively sealed off all of their magic.
It could be removed, but it wasn't something that they could do on their own.
The reason why they were left with their powers in the first place was because it was necessary for the future of the Elven Kingdom.
No matter what, the Elven King and the high elves could be considered as part of the power of the Elven Kingdom.
