Gaining a portal to the Furies' domain, it was a reward.
One that he was entitled to after finishing the exploration quest.
Initially, he thought he would gain access to Nightborns, that holds fragments of the Furies' powers. Powers that he could make his own as long as he learned their names. And seeing the cell confirmed his thought.
Tisiphone's appearance made him doubtful, but the night assured him.
That he was going to be fine.
That this was his reward.
But he was wrong to assume that.
As soon as he set foot on the Furies' domain, he could instantly feel the scorching heat—and the chillingness of suffering lingering in the air. The kind of sensations that could make one's heart pound rapidly.
And then came the splitting crack that rang sharply.
Crack—!
Kai's eyes bulged in shock, and his body collapsed onto the hard stone floor.
