A Tesla Sphere is a form of Necron Tesla Weapon that unleashes a bolt of living lightning that crackles from foe to foe after hitting its target, charring flesh and melting armour. A Tesla Sphere is an arcane Tesla Weapon only found mounted on Necron Obelisks. Each Obelisk will be armed with four such weapons around its hull capable of defending it against anything that enters the airspace around the war machine. Tesla Spheres have an extremely high rate of fire, even more so than a Tesla Destructor, and possess a similar range and degree of power output per shot to most other large Tesla Weapons. Tesla bolts feed off the energy released by the destruction, and the lightning discharge becomes more furious with every fresh arc, almost as if moving with a mind of its own. In some cases, these energetic projectiles have even been observed to crack ceramite and plasteel. Tesla Weapons are named by the Imperium after the ancient Terran scientist Nikola Tesla, who was the first human known to experiment with this type of weapon technology, although the Necrons had perfected it long before humans even existed.
- Apocalypse (6th Edition), pg. 172
- Codex: Necrons (5th Edition), pp. 82, 91, 95
- Codex: Necrons (7th Edition) (Digital Edition), pg. 202
- Deathwatch: The Outer Reach (RPG), pg. 119