Kieran's set of skills was definitely not on the lesser side but after decided to level up [Knights of Dawn Body Tempering Art], which was his core skill to the skill's maximum limit while excluding those skills that didn't have any leveling options, the remaining viable options were only a handful.
First was his hand-to-hand combat series of skills, [Barsical Kick], [Hundred Violent Kicks] [Blade Kick] and [Viper Kick].
Second, the greatsword skill series, [Sword Skill, Dragon Force] and [Sword Skill, Tiger Stance].
Lastly, there was his ancillary skill, [Tracking].
As for [Sword Skill, Myriad Viper]?
Although it has a Sword Skill prefix, technically, it was a Spirit attribute related skill and among all of the different categories, Kieran leaned more towards his combat series.
