Bone Spikes

Bone Spikes is a Primary skill in Diablo III.

In-game
When cast, creates a 8 yards radius circle of bone spikes at the designated location. Enemies within it suffer Physical damage.

Note that Essence is only generated if Bone Spikes actually deal damage.

Runes

 * Sudden Impact: Bone spikes also stun enemies for second on hit.
 * Bone Pillars: Instead of the circle, instantly strikes the target and up to two nearby enemies with large bone pillars for damage as Poison each. No longer deals area damage.
 * Frost Spikes: Damage type changes to Cold, and also leaves a frost patch that reduces the movement speed of affected foes by for  seconds.
 * Path of Bones: Instead of the circle, unleashes a fast-moving 5 yards wide line of spikes that deals damage as Physical as it travels forward, but damage is increased by up to  with distance (farther enemies take more damage). No longer deals damage over time.
 * Blood Spikes: All enemies hit will also bleed for damage as Physical over  seconds and heal the Necromancer for  of total Life over the duration. Both effects stack from multiple applications.

Non-rune enhancements

 * Depth Diggers (Legendary Pants): damage increases by 80-100%.
 * Reilena's Shadowhook (Legendary Two-Handed Scythe): Bone Spikes generate additional 2-5 Essence for each enemy hit, and passively grants 0.5% increased damage for every point of maximum Essence the Necromancer has.
 * Bryner's Journey (Legendary Boots): Bone Spikes have a 20-30% chance to cast a Bone Nova at the target location.
 * Trag'Oul's Avatar Set (Set Bonus for 4 items): while at full Life, healing from Blood Spikes is added to maximum Life for 45 seconds, up to 100% additional Life.
 * Trag'Oul's Avatar Set (Set Bonus for 6 items): Blood Spikes healing is increased by 100%.
 * Simplicity's Strength (Legendary Gem): increases damage by 25% (+0.5% per rank) and heals the character for 4% of maximum Life per hit (rank 25 bonus).
 * Boyarsky's Chip (Legendary Gem): Taunts the first enemy hit for 2 seconds (rank 25 bonus).

Passives

 * Swift Harvesting: increases attack speed by 15%.
 * : grants a 30% chance to trap all enemies hit in a Bone Prison, immobilizing them for 3 seconds.
 * Serration: deal 1% increased damage for every 1.5 yards between the Necromancer and the target (up to 20% at 30 or more yards).