- "A placeable dish that projects a cone of microwave radiation that stuns and impairs enemies."
- — Scorestreak description
It deals 10 damage to any players caught within its cone of radiation every 0.5 seconds (half a second), taking five seconds to completely kill an enemy in Core game modes at full health. The Guardian will slow enemies and impair their vision, and is easily distinguished by the particles emitted by its silver dish. The player gets 10 points every second for suppressing an enemy.
The Guardian is best placed at choke points, long and linear sightlines and to defend objectives while teammates are absent from the area. Hostile Guardians are highlighted in red when using the Engineer perk, making a combination of Engineer and Black Hat excellent when countering Guardians, as they can be easily hacked from behind cover where the player is safe from the wave it produces. However, the player should take care of their surroundings, as unexpected enemies can easily kill the player when hacking the Guardian, which takes approximately five seconds.
Guardians are extremely effective in Hardcore game modes, being caught in the guardian's microwaves results in almost instant kills. Unless your enemy has EMP Grenades or Black Hats, players can effectively block off tight corridors and limit their overall mobility across the map. It should be noted, however, that as of a recent patch, the Guardian's damage in Hardcore game modes has been reduced.
- When carrying the Guardian, a label on the back can be read "1.21 GW". This is a reference to the movie Back to the Future, where 1.21 Gigawatts are required to activate the Delorean time machine.
- When placed, a sticker on the rear can be seen that warns: "extended exposure may cause minor discomfort".
- The Guardian can kill dogs from the K9 Unit Scorestreak.
- The Guardian cannot destroy an RC-XD.
- The Guardian is referred to in the game files as the HPM.