In Diablo 4, the Bone spear Necromancer is a powerful class that relies on maintaining a high Essence level for optimal damage output. This guide will discuss the importance of keeping your Essence topped out and provide tips on achieving this. By understanding the mechanics behind Essence generation and its impact on your bone skills, you can maximize your damage potential and become a formidable force in the game.

Essence Generation and Gear Optimization:
To ensure a constant supply of Essence, optimising your gear and skills is essential. The more Essence you have, the more powerful your bone skills become. Look for equipment that provides Essence generation bonuses, such as rings or items like Umbral. Aim to acquire items with higher Maximum Essence values to increase your damage potential further.

Understanding Serration and Ossified Essence:
Serration and Ossified Essence are two crucial passive skills for the Bone Sphere Necromancer. Serration increases your critical strike chance, while Ossified Essence boosts your overall damage. Both of these passives scale with the amount of Essence you have.

Serration: Every 10 Essence grants a percentage increase in critical strike chance. For example, with 180 Essence, you gain an additional 18% critical strike chance.
Ossified Essence: Every 50 Essence provides a damage multiplier. With 180 Essence, you benefit from a staggering 130% damage increase.
Maintaining Peak Essence:
To keep your Essence topped out, follow these strategies during gameplay:
a. Utilize Corpse Explosion: Even though Corpse Explosion only restores six Essence, it plays a crucial role in maintaining your Essence level. Use it strategically, especially between Bone Sphere casts, to prevent Essence from dropping too low.
b. Leverage Umbral and Penitent Greaves: Equip Umbral and Penitent Greaves, which generate Essence and chill enemies, respectively. Umbral can passively replenish your Essence while you navigate the game world, and Penitent Greaves' chilling effect triggers Umbral's Essence generation even outside combat.
c. Pre-Mining Essence: Use Corpse Tendrils to pre-populate the area with corpses to prepare for encounters. You can quickly replenish Essence during battles by detonating the prepared corpses with Corpse Explosion or other skills.

Optimal Bone Sphere Usage:
To maximize your damage output and Essence efficiency, it's vital to use Bone Spheres strategically. Rather than spamming them continuously, consider the following tactics:
a. Line up Targets: Whenever possible, position enemies in a straight line before casting Bone Spheres. This allows the projectiles to hit multiple targets, increasing your damage potential.

b. Avoid Essence Exhaustion: Be cautious not to exhaust your Essence by mindlessly casting too many Bone Spheres in succession. Keep an eye on your Essence bar and use other skills or Corpse Explosion between casts to prevent Essence from reaching zero.

Scaling Essence and Gear Synergy:
As you acquire more gear with Maximum Essence bonuses and invest in the Ossified Essence passive, maintaining a topped-out Essence level becomes even more significant. The additional Essence will enhance your damage multipliers and critical strike chance, allowing you to optimize your build further.

Conclusion:
Mastering the art of maintaining a topped-out Essence level is crucial for maximizing the potential of your Bone Sphere Necromancer in Diablo 4. By utilizing strategies like pre-mining Essence, leveraging gear with Essence generation bonuses, and understanding the scaling effects of Serration and Ossified Essence, you can unleash devastating damage and become a formidable force in the game.