[Harrow] has a few different abilities that provide buffs to your entire team and this build focuses on making each of them usable. Build stats are well-rounded and we even run a bit of survivability.

Base abilities are run because each has a purpose in his kit when we have equalized stats. Condemn is usually the weakest ability but here it gives us shields for Penance and hits the shield-gate after only two enemies.

[Enemy Radar] helps the entire team to find enemies. The playstyle of the build forces us to sometimes chase down stragglers. It can be replaced with other auras to suit your general playstyle or team composition needs.

Ability stats are above average so we can get decent use out of each ability. Ability strength should be high enough that you hit breakpoints with Condemn. You want to be able to get overshields with as few enemies as possible to abuse the shield-gate.

[Adaptation] is a flex survivability mod and can be replaced with [Rolling Guard] or Vitality. Redirection is not a good choice because it forces you to hit more enemies with Condemn to get a full shield-gate and most of your shields should be coming from Harrow's double overshield passive.

Augur mods and/or [Brief Respite] allow [Harrow] to spam Penance. The ability isn't able to be cast when you have zero shields so this allows you to loop the ability during enemy downtime until you hit the duration cap.

[Natural Talent] helps us to curb the long casting times on all of your abilities. It isn't suggested to cut this mod because your build won't work anywhere near as fluidly.

Arcane Energize and Arcane Aegis are both flex arcanes. Energize might be redundant if you're constantly able to proc Thurible. Aegis just gives you a small chance to become nearly invincible when it procs. Either can be replaced with arcanes that suit your playstyle.