Keep in mind I'm a complete NOOB when it comes to making builds.
Here's how it goes:
Farmer's Scythe
Radiant Scythe
Vow of Piety
Aura of Holy Might This could be replaced with Heart of Fury to increase attack speed, and thus healing due to the Vampiric Scythe.
Conviction
Vow of Silence
Zealot's Fire This is now going to be Watchful Spirit
Balthazar's Spirit
Mysticism: 11
Scythe Mastery: 12+3+1
Earth Prayers: 6
Template Code: A6MC7myrG99x9RgFeJD2e9QIPA
Weapon: Scythe with +20% enchantments and a Vampiric Weapon attachment to keep your health up.
Armour: Full armour with Blessed insignias and runes of attunement.
The idea is to maintain Balthazar's Spirit to keep your energy up and, unless I'm mistaken, Zealot's fire will deal a lot of AoE damage upon the use of Vow of Silence and upon the use of the stances, Vow of Piety and Conviction. Initially you should use Balthazar's Spirit and Zealot's Fire and then Vow of Piety, and if you have good micro ability allow Vow of Silence to end to trigger Zealot's Fire and then instantly recast it, perhaps after casting Aura of Holy Might.
I have not tested this, I was just asking for an opinion and advice before I did any of that. I think it looks okay but might not be able to take large groups, maybe just 1 or 2 groups at a time.
Anyway... what do you think?

EDIT: I just noticed I have no smiting investment to make Zealot's Fire worthwile... I guess a replacement will have to be thought of... Perhaps the Monk enchantment Succor or Watchful Spirit to negate the loss of health due to damage and health degen from the Vampiric Scythe.
The new template code, with Watchful Spirit is: A6MC7myrG99x9RgFeJD2e9PIPA