Sangheili personal energy shield

The Sangheili personal energy shield is the energy shielding system of the Sangheili combat harness.

A Sangheili's armor contains multiple energy shield emitters that when activated will add an extra layer of protection from enemy attacks. These personal energy shields are white and blue unlike their gold MJOLNIR equivalents.

Function
The Elite's armor generates a recharging energy shield (similar to the MJOLNIR shields) that protects against both ballistic fire and plasma weaponry; however after taking enough damage the shields will collapse and the Elite will be vulnerable to further attacks. Like MJOLNIR shields, this shield recharges after being depleted and can be enhanced by the Covenant's overshield technology. There appear to be differences in the strength of the shields, and different ranks of Elites have different amounts of power and recharge capacity in their shield. For example, a sniper rifle headshot will kill a Sangheili Minor, but an Sangheili Ultra's shield can withstand up to four headshots.

Strengths
Unlike the Spartan's MJOLNIR shield, the Elite's shields can resist low caliber munitions like that of an assault rifle. Sometimes the bullets bounce off of the Elite's shields, but still cause damage. This is also true with the M6D magnum, sometimes on harder difficulty levels, if you shoot an Elite with the pistol and don't hit him directly (for example his shoulder), the bullet may bounce off and hit the ceiling. Also, as mentioned above, the Covenant have the ability to create extremely resilient Energy Shields such as the ones featured on Zealots and Ultra Elites, which can even withstand a direct hit from an M41 SPNKR.

Weaknesses
These shields have weaknesses however, as they are susceptible to damage received from plasma-based weapons. An overcharged shot from a Plasma Pistol, a punch from a Spartan-II, or a slash from a Type-25 Brute Shot or Type-1 energy sword can completely drain an Elite's Energy Shields. The shields can also be completely bypassed by using a Needler in Halo CE, Halo 2, Halo 3, and Halo 4. Type-25 plasma rifles are very effective in quickly reducing the Elite personal energy shielding. Additionally a Plasma grenade or Spike Grenade will stick to an Elite even if the shield is fully charged.

Trivia

 * The Elites in the Heretics have personal shields that glow a flamboyant purple. Apart from the peculiar shield-color it also sparks an amethyst-tinted color.
 * Elites were originally supposed to wield a personal triple layered arm shield in-game, similar to a Jackal's. This appears, however, in the Halo Graphic Novel's story The Last Voyage of the Infinite Succor.
 * Early Halo: Combat Evolved screenshots show that the Sangheili energy shields were originally going to be a constant "bubble" around the user.

List of appearances

 * Halo: The Fall of Reach
 * Halo: Combat Evolved
 * Halo: The Flood
 * Halo: First Strike
 * Halo 2
 * Halo Graphic Novel
 * The Last Voyage of the Infinite Succor
 * Halo: Ghosts of Onyx
 * Halo 3
 * Halo: The Cole Protocol
 * Halo Wars
 * Halo: Helljumpers
 * Halo Legends
 * Prototype
 * Halo Evolutions
 * Headhunters
 * Midnight in the Heart of Midlothian
 * Halo: Bloodline
 * Halo: Reach
 * Halo: Fall of Reach
 * Invasion
 * Halo: Glasslands
 * Halo: Combat Evolved Anniversary
 * Halo: The Thursday War
 * Halo 4: Forward Unto Dawn
 * Halo 4
 * Spartan Ops
 * Halo: Spartan Assault
 * Halo: Initiation
 * Halo: Escalation
 * Halo 2: Anniversary