Powerups
In duels, most of the powerups are removed, but in teamplay such as team deathmatch and capture the flag they are crucial for a win.

Quad Damage

Another one of the unique items to the Quake series is the Quad Damage. This powerup lasts 30 seconds and respawns every 120 seconds. The Quad Damage does exactly as advertised; it will multiply your weapon's damage by four. The Quad is the undisputable king of fragging, great for making a come back or increasing a lead.

Invisibility

The Invisibility powerup renders you nearly invisible, leaving only a phased outline of your body for 30 seconds. Respawns every 120 seconds.

Regeneration

With the Regeneration powerup you gain 5 hitpoints every second with a max of 200. It Lasts 30 seconds and respawns every 120 seconds. Great in combination with other powerups or when defending and attacking flags.

Haste

The Haste powerup doubles your movement speed for 30 seconds. It also doubles the firing speed of your weapon. Great for attack and run strategies or flag carrying. Haste spawns every 120 seconds.

In capture the flag games there are also other powerups as well as some of the above. Ammo Regeneration, Scout, Defense, and Double Damage are all on the list.