Viper League

Viper League is the first league in Season 4 and centers around the Black Tusk's activity in The Pentagon and the Southwest zones. This league ran from December 15th to December 28th.

Time Trials
As with previous leagues, the Viper League has 4 time trials for missions; 3 on hard and one on challenging. Unlike the leagues that came before, the challenging mission is not a stronghold this time around.

Space Administration HQ
The Space Administration HQ mission must be completed on hard in order to activate the time trial. The fastest target time is 14 minutes, with the rest being the following:
 * 50:00
 * 40:00
 * 35:00
 * 30:00
 * 25:00
 * 22:30
 * 20:00
 * 18:00
 * 16:00
 * 14:00

Jefferson Plaza
The Jefferson Plaza mission needs to be completed on hard for the time trial to work. The fastest target time is 14 minutes, with the other times being:
 * 50:00
 * 40:00
 * 35:00
 * 30:00
 * 25:00
 * 22:30
 * 20:00
 * 18:00
 * 16:00
 * 14:00

DARPA Research Labs
The DARPA Research Labs main mission needs to be set to hard for the time trial to activate. Its fastest time is set to 15 minutes, with the remaining times being:
 * 50:00
 * 40:00
 * 35:00
 * 30:00
 * 27:00
 * 23:00
 * 21:00
 * 19:00
 * 17:00
 * 15:00

The Pentagon
The Pentagon mission needs to be set to challenging in order to have the time trial. Its fastest time is 25 minutes, with the other times being:
 * 1:00:00
 * 55:00
 * 50:00
 * 45:00
 * 40:00
 * 35:00
 * 32:30
 * 30:00
 * 27:30
 * 25:00

Skill Challenges
The Viper League has two skill challenges: Destroying Weak Points and killing Black Tusk Elites.

Weak Points Destroyed
In order to rank up this challenge, agents must destroy weak points on enemies. The highest rank requires 500 weak points to be destroyed, with the other ranks requiring:
 * 50
 * 100
 * 150
 * 250
 * 300
 * 350
 * 400
 * 450
 * 475
 * 500

Black Tusk Elites Eliminated
This challenge requires agents to kill elite Black Tusk enemies to rank up. 250 elites need to be killed in order to achieve the highest rank, with the remaining ranks needing the following:
 * 15
 * 30
 * 50
 * 75
 * 100
 * 125
 * 150
 * 175
 * 200
 * 250

Reward Track
For every 6 rank achieved in one of the trials, a reward is given.


 * Recruit 1 - Viper (Patch)
 * Recruit 2 - Gear Crafting Cache
 * Recruit 3 - Weapon Crafting Cache
 * Veteran 1 - Season Cache
 * Veteran 2 - Optimization Cache
 * Veteran 3 - Named Item Cache
 * Elite 1 - Season Cache
 * Elite 2 - Optimization Cache
 * Elite 3 - Exotic Cache
 * Agent - The Cursed (Backpack Charm)