You have to make some non-trivial build choices in order to increase the chance of divine essence triggering.
I use following combos:
- Faithful (5/5) + Holy Nova + Shield Crafting (7-10)
- Divine Bolt + Shared Divinity (3-4) + Piety + Shield Crafting (7-10)
The idea is to increase amount of heals by providing more targets (manifested shields).
Though Divine Bolt only goes off of melee hits, even caster/thrower can proc Divine Bolt fairly often using Counter Attack or Lunge (they are AoE attacks and can do a lot of hits if they go off in a big crowd).
Divine Essence only gives 10% increased damage (and it seems to be bugged in the sense it only gives melee damage). This “increased damage” is an additive parameter, that most builds have 500-800% of, so another 10% only adds like 2% actual increase (10%/500%).
10% chance to revive seems to be a common theme, Necromancer also has 10% chance to revive node for example.