The 7th research tree, arriving with Season 3 — it unlocks on the 50th day of the season , and your base must also meet: HQ 33 + Rapid Growth 50% (the tree becomes visible in the lab at Rapid Growth 30%). Unlike the six badge trees, Army Expansion is paid in Electricity and Zents — and the totals are enormous.
Source note: dataset values, complete for all 26 nodes and 310 levels — every node’s per-level costs sum exactly to its node totals. Effect units (flat vs %) will be confirmed against the in-game Stat Overview once the tree unlocks; costs and times are final. The whole tree: 19.06B Electricity · 17.16B Zents · 11,031 days of raw research time .
Branches repeat at rising tiers: Troop Expansion appears five times , and every unit-type branch (Rider / Assaulter / Shooter) has identical costs and effects at each tier.
# Node Effect Levels Effect at max Electricity Zents Raw time 1 Troop Expansion I Troop Capacity 10 300 113,300,000 101,470,000 65d 14h 2–4 Driving / Fighting / Shooting Skills Rider / Assaulter / Shooter Attack 10 each 20 each 181,600,000 each 163,440,000 each 105d 2h each 5–7 Camp Expansion I (Rider / Assaulter / Shooter) Camp Training Capacity 10 each 20 each 228,500,000 each 205,650,000 each 132d 6h each 8 Troop Expansion II Troop Capacity 10 300 454,100,000 408,690,000 262d 19h 9–11 Motorcycle / Shield / Armor Enhancement Rider / Assaulter / Shooter Defense 10 each 20 each 340,300,000 each 306,270,000 each 196d 22h each 12–14 Rapid Training I (Rider / Assaulter / Shooter) Unit Training Speed 10 each 20 each 409,000,000 each 368,100,000 each 236d 17h each 15 Troop Expansion III Troop Capacity 10 300 680,800,000 612,720,000 394d 0h 16–18 Training Optimization (Rider / Assaulter / Shooter) Unit Training Cost Reduction 10 each 10 each 568,100,000 each 511,290,000 each 328d 18h each 19 Troop Expansion IV Troop Capacity 20 800 1,411,200,000 1,270,080,000 816d 16h 20–22 Rapid Training II (Rider / Assaulter / Shooter) Unit Training Speed 10 each 20 each 908,400,000 each 817,560,000 each 525d 17h each 23–25 Camp Expansion II (Rider / Assaulter / Shooter) Camp Training Capacity 20 each 40 each 1,889,400,000 each 1,700,460,000 each 1,093d 10h each 26 Troop Expansion V Troop Capacity 20 800 2,827,200,000 2,544,480,000 1,636d 3h Whole tree 310 19,062,500,000 17,155,750,000 11,031d 13h
Stat Total at full completion From Troop Capacity 2,500 (300 + 300 + 300 + 800 + 800)5 Troop Expansion nodes Rider / Assaulter / Shooter Attack 20 per unit type Driving / Fighting / Shooting Skills Rider / Assaulter / Shooter Defense 20 per unit type Motorcycle / Shield / Armor Enhancement Camp Training Capacity 60 per camp (20 + 40) Camp Expansion I + II Unit Training Speed 40 per unit type (20 + 20) Rapid Training I + II Unit Training Cost Reduction 10 per unit type Training Optimization
How to prioritize: the tree is front-loaded with its best value. Troop Expansion I is the single best node in the tree — +300 Troop Capacity for 113M Electricity. The same +300 costs 4× more at node 8 and 6× more at node 15, and the two 20-level capacity nodes at the end cost 1.4–2.8B each for +800. Early Camp Expansion and the Skills nodes are also cheap relative to their late-tier twins. Research the front of the tree, then let the back simmer.
The real bottleneck is Electricity and Zents, not time. The full tree costs 19.06B Electricity and 17.16B Zents — for scale, the entire HQ 1→35 construction run costs 2.82B Zents, so this one tree costs 6× the Zents of every HQ level combined . A curious constant: at every single level of every node, the Zent cost is exactly 90% of the Electricity cost . And the 11,031 days of raw research time (~30 years!) is why Research Speed % — Bookstore Scientists (+100%), Age of Steel, Rapid Growth — stops being a nice-to-have in Season 3.
The three unit-type branches (Rider / Assaulter / Shooter) are identical at each tier, so each table below covers all three.
Lv Troop Capacity Electricity Zents Research time Power 1 15 5,000,000 4,000,000 2d 21h 26m 40s 6,735 2 30 6,000,000 5,400,000 3d 11h 20m 14,226 3 60 7,100,000 6,390,000 4d 2h 36m 40s 22,307 4 90 8,400,000 7,560,000 4d 20h 40m 31,023 5 120 9,800,000 8,820,000 5d 16h 6m 40s 40,365 6 150 11,400,000 10,260,000 6d 14h 20m 50,365 7 180 13,100,000 11,790,000 7d 13h 56m 40s 61,010 8 210 15,100,000 13,590,000 8d 17h 43m 20s 72,358 9 255 17,400,000 15,660,000 10d 1h 40m 84,454 10 300 20,000,000 18,000,000 11d 13h 46m 40s 97,332 Total 300 113,300,000 101,470,000 480,175
Lv Unit Attack Electricity Zents Research time Power 1 1 8,000,000 7,200,000 4d 15h 6m 40s 8,527 2 2 9,600,000 8,640,000 5d 13h 20m 17,783 3 4 11,400,000 10,260,000 6d 14h 20m 27,783 4 6 13,500,000 12,150,000 7d 19h 30m 38,573 5 8 15,800,000 14,220,000 9d 3h 26m 40s 50,155 6 10 18,300,000 16,470,000 10d 14h 10m 62,529 7 12 21,000,000 18,900,000 12d 3h 40m 75,693 8 14 24,200,000 21,780,000 14d 6m 40s 89,725 9 17 27,800,000 25,020,000 16d 2h 6m 40s 104,660 10 20 32,000,000 28,800,000 18d 12h 26m 40s 120,572 Total 20 181,600,000 163,440,000 596,000
Lv Training Capacity Electricity Zents Research time Power 1 1 10,000,000 9,000,000 5d 18h 53m 20s 9,427 2 2 12,000,000 10,800,000 6d 22h 40m 19,660 3 4 14,300,000 12,870,000 8d 6h 36m 40s 30,734 4 6 16,900,000 15,210,000 9d 18h 43m 20s 42,672 5 8 19,800,000 17,820,000 11d 11h 55,492 6 10 23,000,000 20,700,000 13d 7h 26m 40s 69,206 7 12 26,500,000 23,850,000 15d 8h 3m 20s 83,823 8 14 30,500,000 27,450,000 17d 15h 36m 40s 99,394 9 17 35,100,000 31,590,000 20d 7h 30m 115,982 10 20 40,400,000 36,360,000 23d 9h 6m 40s 133,653 Total 20 228,500,000 205,650,000 660,043
Lv Troop Capacity Electricity Zents Research time Power 1 15 20,000,000 18,000,000 11d 13h 46m 40s 12,878 2 30 24,000,000 21,600,000 13d 21h 20m 26,857 3 60 28,600,000 25,740,000 16d 13h 13m 20s 41,984 4 90 33,700,000 30,330,000 19d 12h 3m 20s 58,271 5 120 39,400,000 35,460,000 22d 19h 13m 20s 75,744 6 150 45,700,000 41,130,000 26d 10h 43m 20s 94,423 7 180 52,600,000 47,340,000 30d 10h 33m 20s 114,322 8 210 60,500,000 54,450,000 35d 16m 40s 135,515 9 255 69,600,000 62,640,000 40d 6h 40m 158,087 10 300 80,000,000 72,000,000 46d 7h 6m 40s 182,119 Total 300 454,100,000 408,690,000 900,200
Lv Unit Defense Electricity Zents Research time Power 1 1 15,000,000 13,500,000 8d 16h 20m 11,314 2 2 18,000,000 16,200,000 10d 10h 23,596 3 4 21,400,000 19,260,000 12d 9h 13m 20s 36,872 4 6 25,300,000 22,770,000 14d 15h 23m 20s 51,187 5 8 29,600,000 26,640,000 17d 3h 6m 40s 66,550 6 10 34,300,000 30,870,000 19d 20h 23m 20s 82,966 7 12 39,400,000 35,460,000 22d 19h 13m 20s 100,439 8 14 45,300,000 40,770,000 26d 5h 10m 119,045 9 17 52,100,000 46,890,000 30d 3h 36m 40s 138,859 10 20 59,900,000 53,910,000 34d 15h 56m 40s 159,957 Total 20 340,300,000 306,270,000 790,785
Lv Training Speed Electricity Zents Research time Power 1 1 18,000,000 16,200,000 10d 10h 12,282 2 2 21,600,000 19,440,000 12d 12h 25,614 3 4 25,700,000 23,130,000 14d 20h 56m 40s 40,031 4 6 30,300,000 27,270,000 17d 12h 50m 55,556 5 8 35,500,000 31,950,000 20d 13h 3m 20s 72,228 6 10 41,200,000 37,080,000 23d 20h 13m 20s 90,056 7 12 47,400,000 42,660,000 27d 10h 20m 109,045 8 14 54,500,000 49,050,000 31d 12h 56m 40s 129,265 9 17 62,700,000 56,430,000 36d 6h 50m 150,801 10 20 72,100,000 64,890,000 41d 17h 23m 20s 173,735 Total 20 409,000,000 368,100,000 858,613
Lv Troop Capacity Electricity Zents Research time Power 1 15 30,000,000 27,000,000 17d 8h 40m 15,456 2 30 36,000,000 32,400,000 20d 20h 32,234 3 60 42,800,000 38,520,000 24d 18h 26m 40s 50,370 4 90 50,500,000 45,450,000 29d 5h 23m 20s 69,908 5 120 59,100,000 53,190,000 34d 4h 50m 90,879 6 150 68,600,000 61,740,000 39d 16h 46m 40s 113,305 7 180 78,900,000 71,010,000 45d 15h 50m 137,188 8 210 90,700,000 81,630,000 52d 11h 43m 20s 162,617 9 255 104,300,000 93,870,000 60d 8h 36m 40s 189,696 10 300 119,900,000 107,910,000 69d 9h 16m 40s 218,528 Total 300 680,800,000 612,720,000 1,080,181
Lv Cost Reduction Electricity Zents Research time Power 1 0.5 25,000,000 22,500,000 14d 11h 13m 20s 14,239 2 1 30,000,000 27,000,000 17d 8h 40m 29,695 3 2 35,700,000 32,130,000 20d 15h 50m 46,410 4 3 42,100,000 37,890,000 24d 8h 43m 20s 64,412 5 4 49,300,000 44,370,000 28d 12h 43m 20s 83,740 6 5 57,200,000 51,480,000 33d 2h 26m 40s 104,405 7 6 65,800,000 59,220,000 38d 1h 53m 20s 126,414 8 7 75,700,000 68,130,000 43d 19h 23m 20s 149,856 9 8.5 87,100,000 78,390,000 50d 9h 43m 20s 174,825 10 10 100,200,000 90,180,000 57d 23h 40m 201,419 Total 10 568,100,000 511,290,000 995,415
Lv Troop Capacity Electricity Zents Research time Power 1 20 15,000,000 13,500,000 8d 16h 20m 11,314 2 40 17,300,000 15,570,000 10d 16m 40s 23,379 3 60 19,900,000 17,910,000 11d 12h 23m 20s 36,228 4 90 22,900,000 20,610,000 13d 6h 3m 20s 49,915 5 120 26,300,000 23,670,000 15d 5h 16m 40s 64,482 6 160 30,200,000 27,180,000 17d 11h 26m 40s 79,984 7 200 34,700,000 31,230,000 20d 1h 56m 40s 96,486 8 240 39,900,000 35,910,000 23d 2h 10m 114,059 9 280 45,900,000 41,310,000 26d 13h 30m 132,775 10 320 52,800,000 47,520,000 30d 13h 20m 152,708 11 360 60,200,000 54,180,000 34d 20h 6m 40s 173,853 12 400 68,600,000 61,740,000 39d 16h 46m 40s 196,279 13 450 78,200,000 70,380,000 45d 6h 6m 40s 220,066 14 500 88,400,000 79,560,000 51d 3h 46m 40s 245,202 15 550 99,900,000 89,910,000 57d 19h 30m 271,761 16 600 112,900,000 101,610,000 65d 8h 3m 20s 299,823 17 650 126,400,000 113,760,000 73d 3h 33m 20s 329,348 18 700 141,600,000 127,440,000 81d 22h 40m 360,421 19 750 157,200,000 141,480,000 90d 23h 20m 392,990 20 800 172,900,000 155,610,000 100d 1h 23m 20s 426,985 Total 800 1,411,200,000 1,270,080,000 3,678,058
Lv Training Speed Electricity Zents Research time Power 1 1 40,000,000 36,000,000 23d 3h 33m 20s 17,592 2 2 48,000,000 43,200,000 27d 18h 40m 36,689 3 4 57,100,000 51,390,000 33d 1h 3m 20s 57,337 4 6 67,400,000 60,660,000 39d 6m 40s 79,585 5 8 78,900,000 71,010,000 45d 15h 50m 103,468 6 10 91,500,000 82,350,000 52d 22h 50m 128,997 7 12 105,200,000 94,680,000 60d 21h 6m 40s 156,181 8 14 121,000,000 108,900,000 70d 33m 20s 185,131 9 17 139,200,000 125,280,000 80d 13h 20m 215,966 10 20 160,100,000 144,090,000 92d 15h 36m 40s 248,804 Total 20 908,400,000 817,560,000 1,229,750
Lv Training Capacity Electricity Zents Research time Power 1 1 20,000,000 18,000,000 11d 13h 46m 40s 12,878 2 2 23,000,000 20,700,000 13d 7h 26m 40s 26,592 3 3 26,500,000 23,850,000 15d 8h 3m 20s 41,209 4 4 30,500,000 27,450,000 17d 15h 36m 40s 56,780 5 6 35,100,000 31,590,000 20d 7h 30m 73,368 6 8 40,400,000 36,360,000 23d 9h 6m 40s 91,039 7 10 46,500,000 41,850,000 26d 21h 50m 109,865 8 12 53,500,000 48,150,000 30d 23h 3m 20s 129,917 9 14 61,500,000 55,350,000 35d 14h 10m 151,267 10 16 70,700,000 63,630,000 40d 21h 56m 40s 173,999 11 18 80,600,000 72,540,000 46d 15h 26m 40s 198,112 12 20 91,900,000 82,710,000 53d 4h 23m 20s 223,692 13 22 104,800,000 94,320,000 60d 15h 33m 20s 250,829 14 24 118,400,000 106,560,000 68d 12h 26m 40s 279,498 15 26 133,800,000 120,420,000 77d 10h 20m 309,789 16 28 151,200,000 136,080,000 87d 12h 341,793 17 31 169,300,000 152,370,000 97d 23h 23m 20s 375,467 18 34 189,600,000 170,640,000 109d 17h 20m 410,902 19 37 210,500,000 189,450,000 121d 19h 36m 40s 448,044 20 40 231,600,000 208,440,000 134d 40m 486,818 Total 40 1,889,400,000 1,700,460,000 4,191,858
Lv Troop Capacity Electricity Zents Research time Power 1 20 30,000,000 27,000,000 17d 8h 40m 15,456 2 40 34,500,000 31,050,000 19d 23h 10m 31,915 3 60 39,700,000 35,730,000 22d 23h 23m 20s 49,448 4 90 45,700,000 41,130,000 26d 10h 43m 20s 68,127 5 120 52,600,000 47,340,000 30d 10h 33m 20s 88,026 6 160 60,500,000 54,450,000 35d 16m 40s 109,219 7 200 69,600,000 62,640,000 40d 6h 40m 131,791 8 240 80,000,000 72,000,000 46d 7h 6m 40s 155,823 9 280 92,000,000 82,800,000 53d 5h 46m 40s 181,415 10 320 105,800,000 95,220,000 61d 5h 26m 40s 208,668 11 360 120,600,000 108,540,000 69d 19h 237,575 12 400 137,500,000 123,750,000 79d 13h 43m 20s 268,240 13 450 156,800,000 141,120,000 90d 17h 46m 40s 300,772 14 500 177,200,000 159,480,000 102d 13h 6m 40s 335,145 15 550 200,200,000 180,180,000 115d 20h 33m 20s 371,458 16 600 226,200,000 203,580,000 130d 21h 40m 409,822 17 650 253,300,000 227,970,000 146d 14h 3m 20s 450,190 18 700 283,700,000 255,330,000 164d 4h 16m 40s 492,671 19 750 314,900,000 283,410,000 182d 5h 36m 40s 537,194 20 800 346,400,000 311,760,000 200d 11h 6m 40s 583,668 Total 800 2,827,200,000 2,544,480,000 5,026,623
Dataset added 2026-09-17, ahead of the Season 3 unlock. Every node’s per-level costs sum exactly to its node totals, and the 26 node totals sum exactly to the tree totals. Effect units and the live Stat Overview will be verified in-game when the tree opens.