Viserys

When I first crossed over, I thought the most insidious enemy was Varys.

I killed Varys.

After getting rid of Varys, I thought the most insidious enemy was Illyrio.

I killed Illyrio.

I killed Illyrio and I slew the centaurs.

The destruction of the Centaur Free Cities has become my biggest worry again!

ah,

I understand more and more now.

My greatest and most sinister enemy is not Robert, not the White Walkers,

He's right above my head!

He is the high and mighty god worshipped by everyone!

There always seems to be such a character in the fairy tale world. They will give them hope when the protagonists are in trouble, and they will also turn the impossible into possible and create miracles. That's right, they are the sea witch who gave the Little Mermaid legs, Jafar who became the power source for Aladdin to liberate the magic lamp, Maleficent who blessed Sleeping Beauty... and Victor, the divination professor at Hogwarts. Victor particularly emphasized that there is deep prejudice in the outside world's evaluation of him, and he is obviously a good professor. As for why the students he taught turned the school into a candy house, and why they could create heartless tin men and vines that grew into towering trees... he had no idea.