Power-Ups
Some zombies and supply drops turn out to have a prize inside: power-ups! These powerful bonuses can turn the tide of a battle in a second. At the same time, though, they require some forethought to be used most effectively.
Power-ups can drop from a freshly killed zombie, at which time they appear as a giant glowing icon. Otherwise, they can be found in Supply Drops and equipped from your inventory as part of your loadout. Power-ups that spawn in the world only last 25 seconds and flash for 10 seconds before disappearing. When you pick up or use a power-up in cooperative play, its effect automatically extends to all teammates regardless of their distance from you or their current status.
Blitzes
Blitz Machines are a triumph of necro-science. If not for the subsequent death and unholy resurrection of most of the personnel involved, they would have become a cornerstone of the German war effort. You can find Blitz Machines in several locations throughout the village, ready to provide upgrades in exchange for a significant number of Jolts. A Blitz provides a powerful, permanent, and passive bonus.
By default, a single character can hold and benefit from four Blitzes (five, if you take the Hoarder Mod). Newly acquired Blitzes will overwrite the oldest ones and you can’t take a single Blitz more than once. However, if you’re incapacitated by damage, you run the risk of losing your Blitzes. If you bleed out, you gradually approach a point where your Blitzes vanish one by one.
While paying into a Blitz Machine, you become vulnerable for a few seconds as your character receives the upgrade. Just remember that you are locked in an animation while receiving the blitz, so it’s not possible to find cover for safety.