Shield

Shields are an Awesomenauts mechanic. They are a defensive Buff. There are different kinds of shields in the game, but they all involve some sort of protection.

Cap Shiels
These shields will reduce any damage above its cap to the cap itself (so any attack that would damage you for more than X, deals X damage instead.)

Derpl Zork

 * Siege Mode (Pussycat Album)

Crowd-Control Immunity Shields
These shields deny all crowd control effects, such as blind or stuns on your 'naut with the exception of slowdowns and Cocoon.

Admiral Swiggins

 * Anchor Hook (Treasure Lottery Map) Upon hitting enemy Awesomenauts only.

Derpl Zork

 * Siege Mode (Default)

Ix

 * Refract (Default)

Qi'Tara

 * Seven Star Strike (Salty Seal) Also a health shield.

Raelynn

 * Snipe (Iron Rifle) Also a health shield.

Vinnie & Spike

 * Smoke Screen (Clown's Mask)

Yuri

 * Warp Time (Spacetime Continuity Device)

Percent Damage Reduction Shields
These shields will reduce a percentage of the damage taken by your 'naut.

Admiral Swiggins

 * Ink Spray (Royal Toy Castle)

Ayla

 * Rage (Default, increases with more targets hit)

Chucho Krokk

 * Hyper Bike (Alien-Repellent Varnish) Shields the Hyper Bike.

Clunk

 * Self-Destruct (Blueprints container)

Commander Rocket

 * Laser Trap (Borgo Cigar Cutter)

Derpl Zork

 * Siege Mode (Force Field)

Dizzy

 * Multi Dash (The Butterfly Tour Yo-yo)

Froggy G

 * Tornado (Can't Touch This)

Genji

 * Monarch Blessing (Default, further increased by Hidden Leaves)

Ix

 * Displace (Vegan Sewer Pizza) Also affects your ally.

Jimmy And The Lux5000

 * LUX Charge (Default, further increased by Bovinian Breastmilk)
 * Missile Barrage (Robo Daddy And Robo Mommy)
 * Rattle Smash (Steel Boxing Gloves)

Leon Chameleon

 * Tongue Snatch (Steel False Teeth, when successfully pulling an enemy Awesomenaut only).

Nibbs

 * Fire Breath (Chocolate Monster Egg)

Professor Milton Yoolip

 * Gripping Gaze (Pancake 3D Printer)

Snork Gunk

 * Shell Bombs (Snail Slime Container)

Scoop of Justice

 * Binding Of Justice (The Penguin Throne)

Sentry X-58

 * Black Hole Sun (Default, further increased by Microfilm)

Ted McPain

 * Stimpack (Armpit Shaving Cream)

General

 * Barrier Magazine Only available to certain 'nauts.

Flat Damage Reduction Shields
These shields will reduce a flat amount of damage taken by your 'naut.

Genji

 * Monarch Blessing (Bronco Yeast)

Health Shields
''These shields protect your 'naut from damage by generating a temporary extra layer of health. Dealing enough damage will destroy the shield.''

Deadlift

 * Protective Pose (Default, further increased by Bovinian Coat)

Qi'Tara

 * Seven Star Strike (Salty Seal) Also a Crowd-Control Immunity Shield.

Raelynn

 * Snipe (Iron Rifle) Also a Crowd-Control Immunity Shield.

Invincibility Shields
''These shields will negate any and all forms of direct damage to your 'naut. Debuffs will still be applied, however.''

Froggy G

 * Splash Dash (Default)

Ix the Interloper

 * Refract (Default)

Ksenia

 * Vanish (Virtual Girl) Roll only.

General

 * Turret (Default while not firing, firing without hitting targets for 3 seconds or 1 second after stop firing)
 * Teleport (During the very end of the teleport)

Invincible units are identified by this icon: