Power Level

Power (previously called as Power Level) is a measure of the strength of Weapons, Traps, Defenders, Heroes, Survivors and the player's Home Base. It is also measures the difficulty of Missions and Expeditions.

Item Power

 * All inventory items have a Power that depends on their type, Rarity and level.
 * The Power of an item can be increased by leveling and evolving it.
 * Higher rarity items have higher Power than others of the same type and level (with the exception of Mythic Heroes).
 * On Heroes, Weapons, Traps and Defenders, the Power merely serves as an indicator of the item's strength, and has no influence on game mechanics.
 * Survivors and Lead Survivors however increase the player's F.O.R.T. Stats proportionally to their Power when placed in Survivor Squads.

Calculation
An approximate formula to calculate power for an individual item is as follows: Power = Round( Base Power + ( (LVL - 1) * LVL Constant ) + ( (Star LVL - 1) * EVO Constant ) ) LVL is the current level of the item, and Star LVL is the current Evolution Tier of the item. Base Power, LVL Constant, and EVO Constant in the above formula depend on the type and rarity of the item, and are as follows:
 * * This row currently applies only to Mythic Subordinates. Mythic Heroes use the same values as Legendary Heroes.
 * The above formula fails only for Level 40 Rare Lead Survivors, yielding a power of 71, whereas 72 would be correct.

Table
The table below shows the Power Level for all inventory items given their Rarity and level. The values have been obtained by leveling the respective items in game and noting down the power. Currently, the calculations leading to these values are unknown, although attempts have been made to find approximate formulas
 * Heroes, Weapons, Traps, Defenders and Subordinate Survivors share the same power values.
 * Lead survivors are different from the rest. At level 1, they start out exactly as other items, but when leveled up, they scale like other items of one rarity below.
 * Mythic Heroes' power is the same as for Legendaries.

Homebase Power
Home Base Power is an overall measure of how powerful the player's active Heroes, Weapons and Traps can be during missions. It is displayed in the top left of the main menu with the zap symbol. Homebase Power is a combination of the Power across all Survivor Squads, Upgrade, and Research Points.

Teaming up with other players also gives you a temporary boost to power and F.O.R.T. Stats.

Recommended Power
Recommended Power is a composite rating based mostly on the bonus F.O.R.T. Stats granted by the Skill Tree and Survivor Squads.