Days 76-80. 3 waves, each starting at 12:00.
Up to 3 crises at once, picked from Cold Wave Strikes (29%, 2 days), Days of Overcast Rain (29%, 2 days), Mold Infestation (23%, 3 days), Rat Infestation (20%, 3 days). Waves still come on crisis days.
Starts with 
Endless: They Didn't Wait.
Each wave pays its kind's pack from Endless rewards, tiers 15-19 when it ends.
Waves
3Weather
9Rolled from Endless weather, tiers 10-40.
| Weather | Endless Story | Pure Endless | Light | Cold |
|---|---|---|---|---|
 Rainy | 32% | 32% | 1 | 0 |
 Cloudy | 21% | 11% | 1 | 0 |
 Mild Cold | 9% | 9% | 1 | 1 |
 Moderate Cold | 9% | 9% | 1 | 2 |
 Severe Cold | 9% | 9% | 1 | 3 |
 Heavy Rain | 9% | 9% | 0.5 | 0 |
 Clear | 6% | 6% | 2 | 0 |
 Continuous Rain | 6% | 6% | 0.5 | 0 |
 Heavy Smog | 0% | 10% | 1 | 0 |
From the game files10
EndlessTier 16
| id | 16 |
|---|---|
| Tier | 16 |
| EnterDay | 76 |
| WaveClockHour | 12 |
| WaveTemplateId | 16 |
| WaveCountMul | 1 |
| WaveHpMul | 6.6 |
| WeatherPoolId | 5 |
| CrisisPoolId | 1 |
| CrisisConcurrent | 3 |
| WaveOverlapCrisis | 1 |
| DronePowerMul | 1.8 |
| WaveDayTemplates | [0,1162,0,1164,1166] |
| PreFinalEventId | 48036 |
| WaveRewardSetIds | [71062,71063,71064] |
| WaveLootGroupId | 8060 |