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Class
Cleric
RollQuest summary of the SRD 5.1 rules, not a quotation.
Starting at 5th level, when an undead fails its saving throw against your Turn Undead feature, it is instantly destroyed if its challenge rating is at or below a threshold that scales by cleric level: CR 1/2 at 5th, CR 1 at 8th, CR 2 at 11th, CR 3 at 14th, CR 4 at 17th.
RollQuest ships the D&D 2014 SRD as a content pack, on a 5e character sheet that does the maths - roll from the sheet and let the numbers work themselves out. Free to start.