Kai came to Kaelmorath's domain so that he could complete the Reckless Fray Ending and be able to summon Kaelmorath to the real world through the Deep Slumber Legacy Skill, as he did with Perion.
But he realized that in order to do that, he would need to complete both Ending Fragments.
It was easier with Perion since he only has one Ending Fragment, so the Ending Fragment of Stone was mixed together with the Stone Ending to create that beautiful—but overwhelming scenery of shifting nature.
Finishing the Reckless Fray Ending would not be that easy.
Kai would need to complete both Ending Fragments before he could finish the ending.
He had only come to realize it when he arrived in the House of Night earlier.
As much as he wanted to grow stronger quickly, he could not force it. Not when the decision was mainly in Kaelmorath's hands. And since his relationship with Kaelmorath is not good at all, he came with the intention to make a compromise.
