Days 36-40. 3 waves, each starting at 12:00.
Up to 2 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). No wave comes on a crisis day.
Starts with 
Endless: The City is Dead, 
Fallen Overnight.
Each wave pays its kind's pack from Endless rewards, tiers 8-9 when it ends.
Waves
3Weather
7Rolled from Endless weather, tiers 7-9.
| Weather | Endless Story | Pure Endless | Light | Cold |
|---|---|---|---|---|
 Rainy | 28% | 28% | 1 | 0 |
 Cloudy | 28% | 18% | 1 | 0 |
 Clear | 14% | 14% | 2 | 0 |
 Moderate Cold | 10% | 10% | 1 | 2 |
 Heavy Rain | 10% | 10% | 0.5 | 0 |
 Continuous Rain | 10% | 10% | 0.5 | 0 |
 Heavy Smog | 0% | 10% | 1 | 0 |
From the game files18
EndlessTier 8
| id | 8 |
|---|---|
| Tier | 8 |
| EnterDay | 36 |
| CalmDays | 1 |
| WaveClockHour | 12 |
| WaveTemplateId | 8 |
| WaveCountMul | 1 |
| WaveHpMul | 3.4 |
| WeatherPoolId | 4 |
| CrisisPoolId | 1 |
| CrisisConcurrent | 2 |
| FallMapPoints | [1005] |
| StoryFallMapPoints | [1005,1103] |
| FallEventId | 48084 |
| DronePowerMul | 1.4 |
| PledgeWaveTemplateId | 108 |
| BroadcastEventId | 48024 |
| WaveDayTemplates | [0,1082,0,1084,1086] |
| DroneFallMapPoints | [1103,1106,1105] |
| WaveRewardSetIds | [71056,71072,71058] |
| WaveLootGroupId | 8058 |
