Guys i forgot a novel i read a long time ago and can barely remember some stuff but what i do remember is that the mc is an ice user and there was an arc that he served in the military and he fought the sect members(that volunteered to assist) that are not following the rules and turned the whole sect community against him... Some details are the following: - he lived in a white tower i think - he uncovered the malpractices of the sects like torturing some military personnel - he attended the sect gathering and killed all those who fought him, some are a river something dude