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The Amplification System is a late-game progression mechanic in The Ants: Underground Kingdom that allows players to strengthen key buildings and unlock T11 Assault Soldier Ants.
Once your Queen reaches Level 25, buildings can be amplified using Amp Crystals, unlocking additional buffs and powerful upgrades across your colony.
The system has two major components:
• Building Amplification – Upgrade buildings using Amp Crystals
• Assault Soldier Ants Evolution – Upgrade evolutions using Amp Crystal Fragments
Together, these systems unlock the ability to evolve T10 Soldier Ants into T11 Assault Soldier Ants.
The Amplification System is essential because it unlocks T11 Assault Soldier Ants, the next tier of Soldier Ants after T10. Unlocking T11 creates a major power spike for your colony and significantly improves combat performance.
Key advantages of T11 Assault Soldier Ants include:
Because of these advantages, players with T11 Assault Soldier Ants gain a major edge in both PvP and PvE, including events such as Pangolin, Groundhog, Mine Battles, and Island Wars.
| Building | Main Benefits |
|---|---|
| Queen | T11 Unlock |
| Shooter Ant Nest | T11 Unlock Shooter Hatch Cap Shooter Damage Amplification Shooter Damage Mitigation |
| Carrier Ant Nest | T11 Unlock Carrier Hatch Cap Carrier Damage Amplification Carrier Damage Mitigation |
| Guardian Ant Nest | T11 Unlock Guardian Hatch Cap Guardian Damage Amplification Guardian Damage Mitigation |
| Special Ant Nest | T11 Unlock Special Ant Exp Bonus |
| Evolution Fungi | T11 Evolution Unlock Evolution Speed |
| Mutation Flora | All Soldier Ants Attack |
| Insect Habitat | Garrison Defense Garrison Health All Soldier Ants Defense |
Amplification upgrades follow a two-tier level structure.
Each level has 5 sub-levels.
After completing 5 sub-levels, the main amplification level increases.
Example of sub-level upgrades:
0-0 → 0-1 → 0-2 → 0-3 → 0-4 → 1-0
Example of overall progression:
0-0 → 0-4
1-0 → 1-4
2-0 → 2-4
…
10-0 (Maximum Level)
Note that the cost of Amp Crystals remains the same for each of the five sub-level upgrades and only changes when the next main amplification level is reached.
In other words:
0-0 → 0-1 → 0-2 → 0-3 → 0-4 → 1-0 all use the same Amp Crystal cost per upgrade
After the building reaches the next level, the Amp Crystal cost increases, and the new cost remains the same again for:
1-0 → 1-1 → 1-2 → 1-3 → 1-4 → 2-0
This pattern continues until the maximum level 10-0.
| Lvl |  |  |  |  |  |  |  |  |
|---|---|---|---|---|---|---|---|---|
| 0-0 | 30 | 13 | 13 | 13 | 7 | 12 | 6 | 6 |
| 1-0 | 45 | 20 | 20 | 20 | 11 | 18 | 9 | 9 |
| 2-0 | 59 | 26 | 26 | 26 | 14 | 23 | 12 | 12 |
| 3-0 | 77 | 34 | 34 | 34 | 19 | 30 | 15 | 15 |
| 4-0 | 90 | 40 | 40 | 40 | 22 | 36 | 18 | 18 |
| 5-0 | 110 | 49 | 49 | 49 | 27 | 44 | 22 | 22 |
| 6-0 | 135 | 60 | 60 | 60 | 33 | 54 | 27 | 27 |
| 7-0 | 165 | 74 | 74 | 74 | 41 | 66 | 33 | 33 |
| 8-0 | 200 | 90 | 90 | 90 | 50 | 80 | 41 | 41 |
| 9-0 | 232 | 104 | 104 | 104 | 58 | 92 | 47 | 47 |
To unlock T11 Assault Soldier Ants, several key buildings must reach specific Amplification Levels.
Below are the minimum requirements:
| Building | Required Amplification Level |
|---|---|
| Queen | Level 10 |
| Shooter Ant Nest | Level 8 (Level 10 for T11 Shooters) |
| Carrier Ant Nest | Level 9 (Level 10 for T11 Carriers) |
| Guardian Ant Nest | Level 7 (Level 10 for T11 Guardians) |
| Special Ant Nest | Level 9 |
| Evolution Fungi | Level 10 |
Once unlocked, all T10 Soldier Ants can instantly mutate into T11 Assault Soldier Ants at no cost.
Amp Crystals can be obtained through both free-to-play activities and paid packs.
Free-to-Play Sources Include:
These free sources should be prioritized by all players, as they are currently the only consistent way for free-to-play players to obtain Amp Crystals.
Paid Sources Include:
In addition to building upgrades, the Amplification System also includes a special evolution path required to unlock T11 Assault Soldier Ants.
These evolutions require Amp Crystal Fragments instead of Amp Crystals.
Key points:
| Evolution | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Swift Stride | 16 | 20 | 26 | 30 | 36 | 42 | 50 | 56 | 64 | 70 | ||||||||||
| Tactics Research I | 20 | 26 | 32 | 36 | 44 | 52 | 60 | 68 | 76 | 86 | 96 | 104 | 116 | 126 | 138 | 158 | 166 | 182 | 192 | 204 |
| Precise Resistance I | 20 | 26 | 32 | 36 | 44 | 52 | 60 | 68 | 76 | 86 | 96 | 104 | 116 | 126 | 138 | 158 | 166 | 182 | 192 | 204 |
| All Soldier Ants Damage Mitigation | 24 | 30 | 38 | 44 | 52 | 62 | 72 | 82 | 90 | 102 | 114 | 124 | 136 | 150 | 164 | 180 | 198 | 216 | 230 | 244 |
| All Soldier Ants Damage Amplification | 24 | 30 | 38 | 44 | 52 | 62 | 72 | 82 | 90 | 102 | 114 | 124 | 136 | 150 | 164 | 180 | 198 | 216 | 230 | 244 |
| Feral Instinct | 28 | 36 | 44 | 52 | 60 | 72 | 84 | 96 | 106 | 120 | 134 | 146 | 160 | 176 | 194 | 212 | 232 | 254 | 270 | 286 |
| Excellent Strike I | 32 | 40 | 50 | 60 | 70 | 84 | 98 | 110 | 124 | 138 | 156 | 170 | 186 | 204 | 224 | 246 | 268 | 294 | 312 | 330 |
| Iron Will I | 32 | 40 | 50 | 60 | 70 | 84 | 98 | 110 | 124 | 138 | 156 | 170 | 186 | 204 | 224 | 246 | 268 | 294 | 312 | 330 |
| Flexible Body I | 38 | 46 | 58 | 68 | 80 | 96 | 114 | 126 | 142 | 160 | 178 | 196 | 214 | 234 | 258 | 282 | 308 | 338 | 358 | 380 |
| Assault Pincer | 42 | 54 | 66 | 78 | 92 | 108 | 128 | 144 | 162 | 180 | 202 | 222 | 244 | 266 | 292 | 320 | 352 | 384 | 408 | 432 |
| Assault Acid | 42 | 54 | 66 | 78 | 92 | 108 | 128 | 144 | 162 | 180 | 202 | 222 | 244 | 266 | 292 | 320 | 352 | 384 | 408 | 432 |
| Assault Ventral | 42 | 54 | 66 | 78 | 92 | 108 | 128 | 144 | 162 | 180 | 202 | 222 | 244 | 266 | 292 | 320 | 352 | 384 | 408 | 432 |
| Assault Soldier Ants | 1772 | |||||||||||||||||||
| Excellent Strike II | 70 | 80 | 92 | 106 | 120 | 138 | 152 | 166 | 182 | 200 | 218 | 232 | 246 | 260 | 276 | 292 | 310 | 328 | 348 | 368 |
| Iron Will II | 70 | 80 | 92 | 106 | 120 | 138 | 152 | 166 | 182 | 200 | 218 | 232 | 246 | 260 | 276 | 292 | 310 | 328 | 348 | 368 |
Amp Crystal Fragments can be obtained through both free-to-play activities and paid packs.
Free-to-Play Sources Include:
The only direct Paid Source of Amp Crystal Fragments is the $10 Warzone Supply – Amp Evo Supply giving 250 Amp Crystal Fragments weekly.
Amp Crystals can also be converted to Amp Crystal Fragments.
Conversion rate:
10 Amp Crystals → 13 Amp Crystal Fragments
Important notes:
• Conversion is one-way only
• Fragments cannot be converted back into crystals
Players should convert carefully depending on whether they need:
• Building upgrades (Crystals)
• Evolution upgrades (Fragments)
To accurately calculate the amount of Amp Crystals and Amp Crystal Fragments you still need, as well as the approximate time before you get T11 Assault Soldier Ants, please head over to the SKY T11 Calculator.
For most players, the fastest path to unlocking T11 Assault Soldier Ants is to prioritize the following buildings:
Queen → Amplification Level 10
Evolution Fungi → Level 10
Your primary Soldier Ant Nest (Shooter / Carrier / Guardian)
Before unlocking the T11 evolution, you should focus on upgrading only one Soldier Ant Nest. This allows you to unlock T11 for your primary soldier type much faster.
Once your first T11 soldier type is unlocked, you can then begin upgrading the remaining Soldier Ant Nests.
If you try to upgrade all Soldier Ant Nests to Level 10 before unlocking the T11 evolution, you may delay unlocking T11 Assault Soldier Ants by several weeks.
Focusing your Amp Crystals on these priority buildings will unlock T11 much faster than upgrading all buildings evenly.
It is also important to keep your Evolution Fungi Amplification Level close to your Queen’s level, because many evolutions require a minimum Evolution Fungi level. If it falls too far behind, your progression in the evolution tree may be blocked.
