Secret Vaults

"If you haven't done so already, download Battle Nations v3.3 and you'll be one of the first to access our newest feature- Secret Vaults!!! This will be one of your only chances to acquire previously released Limited-Time only promotional units."

- "KoolRanch", Z2 Customer Relations Manager

Overview
Secret Vaults are special events where players have a chance at earning Units beyond their current level. In addition, players have the chance to earn past promo units that are no longer available, such as the Mammoth Tank. Secret Vaults were introduced in the 3.3 Patch and have made regular appearances right before Boss Strike.

The Secret Vault is available to all players that are Level 10+. Similar to Boss Strike, the event icon appears below the player's avatar with a countdown timer. When accessed, players are be able to see what units can be earned and can roll to earn these units with Nanopods. Players can purchase a set of 3 rolls for and/or a set of 10 rolls (which provides an 11th for free) for. For lower level ranges, 3 rolls cost and a set of 10 rolls, as well as its free 11th roll, costs. As of the 9th Secret Vault event, this changed to 1 roll for or 10 rolls (which provides an 11th for free) for.

Each roll will provide a unit at random. The unit's value is guaranteed to match or best the player's Nanopod-spend. Depending on the player's level, different units will be made available. The level ranges were as follows:


 * 10-19
 * 20-29
 * 30-44
 * 45+

Since the 7th Secret Vault, the level ranges have been changed:


 * 10-19
 * 20-29
 * 30-39
 * 40-54
 * 55+

Secret Vault 1
The first Secret Vault event offered the following units:

Active: Ran through the end of January 2014 - beginning of February 2014

Secret Vault 2
The second Secret Vault event offered the following units:

Active: Ran through the end of February 2014

Secret Vault 3
The third Secret Vault event offered the following units:

Active: Ran through the end of March 2014

Secret Vault 4
The fourth Secret Vault event offered the following units:

Active: Ran through the end of April 2014

Secret Vault 5
The fifth Secret Vault event offered the following units:

 Jackpot : Legendary Mammoth

Active: Ran through the second half of May 2014

Secret Vault 6
The sixth Secret Vault event offered the following units:

Active: Ran through the second half of June 2014

Secret Vault 7
The seventh Secret Vault event offered the following units:

 Jackpot : Aero Jetpack Trooper

Active: Ran through the second half of July 2014

Secret Vault 8
The eighth Secret Vault event offered the following units:

 Jackpot : Legendary Boar  Ultra Rare : Aero Jetpack Trooper  Super Rare : Bora-Bora Hovercraft

Active: Ran through the second half of August 2014

Secret Vault 9
The ninth Secret Vault event offered the following units:

 Jackpot : Wandering Samurai  Ultra Rare : Legendary Boar  Super Rare : Bora-Bora Hovercraft

Active: Ran through the first half of September 2014

Secret Vault 10
The tenth Secret Vault event offered the following units:

 Jackpot : Tank Crusher  Ultra Rare : Legendary Mammoth  Super Rare : Wandering Samurai

Active: Ran through the first half of October 2014

Secret Vault 11
The eleventh Secret Vault offered the following units:

 Jackpot : Mechanized Trooper  Ultra Rare : TANK CRUSHER  Super Rare : Demolisher

Active: Ran through the second half of November 2014

Secret Vault 12
The twelfth Secret Vault offered the following units:

 Jackpot : Armored SUV  Ultra Rare : Weapon Technician  Super Rare : Bora-Bora Hovercraft  Rare : Demolisher

Active: Ran through the first half of January 2015

Secret Vault 13
The thirteenth Secret Vault offers the following units:

 Jackpot : Legendary Raptor  Ultra Rare : Jedrek the Crusher  Super Rare : Armored SUV  Rare : Weapon Technician

Active: Ran through the second half of February 2015

Secret Vault 14
The fourteenth Secret Vault offers the following units:

 Jackpot : Ancient Sentry  Ultra Rare : Mechanized Trooper

Active: Ran through the first half of March 2015

Secret Vault 15
The fifteenth Secret Vault offers the following units:

 Jackpot : Nomad Elemental Rover  Ultra Rare : Legendary Mammoth  Super Rare : Raider Summoner  Rare : Ancient Sentry

Active: Runs through the first half of April 2015