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| Operation | Story |
| WB-4 Let the Old Times Go |
Where Vernal Winds Will Never Blow: Case Investigation, Onsite Previous WB-3 Next WB-ST-2
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| The gazer did not want to keep an old friend reminiscing about the old days, or the old workshop. <Yumen Catastrophe Defenses> Units placed here deal more damage to ground units and take less damage from ground units <Roadblocks> Blocks multiple enemies | |
| Recommended level | Elite 1 Level 20 | ||
|---|---|---|---|
| Sanity | Drill Plan | EXP | LMD |
| 12 | 1 | 120 (144) | 120 (144) |
| Unit Limit | Initial DP | Life Points | Enemies |
| 8 | 10 | 3 | 40 |
| Static devices | Roadblocks ×4 | ||
| First clear | 3 Stars  3 Stars  50 |
|---|---|
| Regular | Guaranteed 12 Common  Uncommon  |
| Normal | Di Beast ×23, Shanhaizhong Skirmisher ×1, Shanhaizhong Relayer ×6, Shanhaizhong Desperado ×10 |
|---|
| Recommended level | Elite 1 Level 20 | ||
|---|---|---|---|
| Sanity | Drill Plan | EXP | LMD |
| 12 | 1 | 120 (144) | 120 (144) |
| Unit Limit | Initial DP | Life Points | Enemies |
| 8 | 10 | 3 | 40 |
| Static devices | Roadblocks ×4 | ||
| First clear | 3 Stars |
|---|---|
| Regular | Guaranteed  |
| Extra |        |
| Normal | Di Beast ×23, Shanhaizhong Skirmisher ×1, Shanhaizhong Relayer ×6, Shanhaizhong Desperado ×10 |
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