Prep the fight by casting Decrepify so all our hits proc cooldown reduction on everything.Decrepify is important for reducing our cooldowns and makes us more survivable at the same time.It's especially notable as one of the few pixel-pull skills in the game. It also triggers Aspect of Grasping Veins, which is handy from time to time for extra damage. Corpse Tendrils Slows, Stuns, and pulls every monster (except Bosses) into a single space so that all of our AoE damage becomes more effective.Bone Storm allows us to stay safe early in our progression with a shield using the Defensive Aspect of Shielding Storm on our Leg or Chest slots.We also take Ghastly Blood Mist to generate a few extra corpses so we can Corpse Tendrils at will. Blood Mist is the only Skill the Necromancer has to provide Immune (which also provides Unstoppable).Our Best In Slot generation setup with Resource Aspect of Exposed Flesh keeps us completely full. Bone Splinters for Essence generation.The second damage component can make positioning important when fighting elites or bosses. Bone Spear is our main damage and hits enemies with both the main hit and reflected shards.

Caged Heart of The Barber - This one looks slow (we often one-tap enemies anyway) but if you find yourself in situations where you need tremendous amounts of damage to deal with your foes, look no further than the damage amplifying powers of The Barber!.

Caged Heart of the Calculated - We burn LOTS of resource with Bone Spear, so having an extra automatic stun can keep enemies pinned down (which also keeps us alive more often).

If 'suppressed' means 20% less damage taken, then this one adds extremely strong survivability!

Caged Heart of Revenge - This one will need testing.

Caged Heart of the Prudent Heart - Bone Spear is played primarily as a glass canon, so having an instant Immunity to save us from bad situations is extremely valuable for those rare times when we do get hit.

Adding more Crit Damage is extremely valuable.

Caged Heart of Tempting Fate - Our main goal is to get to near 100% Critical Strike Chance with the build, so that we can one-tap enemies.

Caged Heart of the Great Feast - If we have enough resource generation, we can sustain an extra multiplier for tons of extra damage.

With this in mind, let's look at the top 3 best Caged Hearts (and alternatives) for this build: Best-in-Slot Caged Hearts

Diablo 3 bone spear build necromance