Gola Tlugvi means "Winter Tree" in Cherokee. The association of Dark Knight with winter makes sense as it is a Job which is associated with Darkness element and winter is the darkest season of the year, having the longest nights. Dark Knight is not associated with healing, only with taking away or harming, and winter is a season which is viewed mostly negatively, having few positive characteristics (though groundwater replenishment and water derived from snowmelt is rarely considered). Winter is associated with hardship, endurance, and limits on activities. It is logical the only elemental spell Gola Tlugvi uses is (besides all the Dark-element spells) Blizzard II, a spell with a name fitting winter time.