Ancile

"Provides composite protection against firearms and missile weapons. Does not protect against energy weapons. Forms a protective sphere that affects all robots within its area of effect. Upon taking damage shield loses capacity that regenerates over time"

Ancile (Heavy Shield)
This shield costs 1,500 gold and protects the player from all weapon fire except beam and plasma weapons (such as the Gekko, Zeus, and Taran).

Unlike the Écu, this device projects an energy field around the player, protecting not just the player, but any allies who are within the field. When being shot at by conventional weaponry, an electric blue honeycomb pattern can be seen in the direction of the shooter. After a brief period of no fire hitting the shield, it will begin to regenerate by 5% per second.

After Update 1.4.1, the Ancile, along with Fūjin and Carnage shields, no longer blocks friendly fire.

Both the Carnage and the Fūjin have energy shields that function almost identically to the Ancile, although the Fūjin's shield regenerates much faster.

When an Ancile (or the shield on the Carnage or Fūjin) receives too much simultaneous fire from different angles, some bullets will get through.

As the energy field is rather large (35m), Anciles are vulnerable to spread projectile weapons like Thunder or Punisher, because all bullets hitting the shield will drain it. That is, a Thunder at 400m distance would do only minimal damage to a robot, but can take down an ancile with just a few shots.

Also, because of its large size, enemy bots can walk inside the shield and cause a lot of damage without having to destroy the shield in the first place. The Fujin, when in sentry mode, is especially suseptible to this tactic. Always make sure to frequently check if anyone is flanking you, as you are most vulnerable when your back is turned.

Note: The values below have changed in the 2.5/2.6 updates and need verification.

Trivia

 * The Ancile was introduced as part of the update 0.8.4
 * In ancient Rome, the Ancile was a divine shield said to have fallen from the heavens. Eleven replicas were made in order to confuse thieves trying to steal the actual shield.
 * The Ancile is, by far, the rarest weapon to be seen on the battlefield in the game. This is most likely because of the fact that it does nothing against some of the most powerful weapons in the game: the plasma weapons, and because the Carnage and Fūjin already simply have a built-in one. (On the other hand, every Legend League player seem to have at least one Lancelot+Ancile, or even several)
 * Before Update 1.4.1, energy shields, including the Ancile, blocked friendly fire, though it did not drain from the shield. If an ally shot from within the field, the shot went through like normal. As with enemy energy weapons, friendly energy weapon fire was able to pass through the shield.