Talk:Erya Uzruth/@comment-216.172.126.236-20171204004908/@comment-2804:7F7:E183:66E4:0:0:0:1-20171207010224

It's not explicited, but was writen in the LN that he was very annoyed to be around Momon for a few days, a being clearly superior to him.

My guess is envious/hateful feelings.