The Shield Pack is used by both the Raider and the Brute classes. When activated, the pack begins to drain energy to put up a defensive barrier. This barrier converts damage into energy loss, rather than hurting the user. This pack can be used to make a player's health pool deceptively large, especially when combined with the Perk "Potential Energy" or "Survivalist". Upgrades add shield effectiveness twice, making the shield have a larger damage threshold before being depleted. At max level, the shield drains approximately one point of energy per 8 points of damage, on top of the standard drain over time when activated. The Raider pack drains at approximately one point of energy at 6.5 points of damage.