Power Screen

Power screen also known as 'Energy Shield' is an unused type of armor is not seen in any level in Quake II. A plasma screen equivalent of the Energy Armor, the power screen has to be activated to be used and can be deactivated at will. In this way, the screen can be saved for more difficult fights whilst being put away during easy fights.

Power screen uses Cells as power. When activated, the armor's value is equal to that of the player's current amount of cells; when the player is hit by an enemy, the player's stocked Cells amount is reduced by amount of damage absorbed.

Power screen absorbs 1/3 of damage taken from front and 2/3 of damage taken from back. If used along with blunt trauma armor, Power screen provides even less survivability. Thankfully, in Quake 2, the Power Screen can still be obtained using the specific cheat: /give power screen via Console Commands.

The enemy Brains is used with a Power Screen to blunt your force from the attacks.

Trivia

 * However, the powerup was removed some of its content after the later changes and chose to simply hide it.