Holy Freeze Paladin

I am just starting the season, I’ve always found the auras (holy freeze, holy shock, holy fire) very interesting. I am wondering what the attack skill you use with the aura is, zeal? Charge? Vengeance? I’m not really sure how to build it or what to aim for. I understand it’s late in the season I’m just looking to have a little casual fun. If anyone can suggest how to attack with this build I would greatly appreciate it. Thanks!