Boosts - every source and how they stack
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Quick answer: for each stat the game adds up all flat bonuses and all percentage bonuses from every source, then applies them once: (base + flat bonuses) × (1 + sum of percentages). Percentages from different sources add, they do not multiply each other. The one exception is your heroes’ battle skills, which multiply on top in battle.
The stacking rule
Section titled “The stacking rule”- Each source (a building, research, VIP, War Chest, an item, a title…) puts its own bonus on a stat.
- The game adds all flat bonuses together, and all percentages together.
- Result = (base + flat bonuses) × (1 + all percentages).
There is no general cap. Negative bonuses (for example a bad kingdom title) subtract from the same sum.
Example: army attack. VIP 10 gives +12%, War Chest T3 +15%, the Overlord title +15% and an Attack Boost item +20%. Your troops fight with 12 + 15 + 15 + 20 = 62% more attack: × 1.62, not 1.12 × 1.15 × 1.15 × 1.2.
Troop stats. A troop’s attack is boosted by the all-army attack bonuses plus the bonuses for its own type (infantry, ranged, cavalry or siege), in one sum. Defense and HP work the same way. These are fixed on the army when it leaves your castle.
Heroes in battle. The battle skills of the heroes in the army then multiply the troops’ stats again: × (1 + hero bonuses). See Heroes in battle.
Where bonuses come from
Section titled “Where bonuses come from”| Source | What it boosts | Details |
|---|---|---|
| Buildings | Each building’s own stat (march size, training capacity, infirmary capacity, storage…). Percent bonuses: Manor (march size), Barracks (training speed), Academy (research speed), Workshop (forging speed). | Buildings reference |
| Research (Academy) | Troop stats, production, speeds, capacities and more, per node. Each node shows Current and Next Level. | Research |
| VIP | Army attack, defense and HP (up to +20%), march speed (up to +15%), gather load (up to +20%), resource production, forging speed, vault, EXP. Permanent. | VIP |
| War Chest | Army attack, defense, HP, max army size, march slots, march speed, train and heal speed, loot. Changes with your tier. | War Chest |
| Heroes, economy skills | Research, construction, training and healing speed, production, upkeep and training cost. The skills of every hero you own add up, deployed or not. | below |
| Heroes, battle skills | Troop attack, defense and HP, only for the army the hero is in. | Heroes in battle |
| Bag items | Timed boosts (table below). | below |
| Kingdom titles | Given by the Overlord of your kingdom (table below). | Fortresses and Kingdom War |
| Fortresses | +20% to +25% attack and defense or HP for one troop type, for the guild that holds the fortress. | Fortresses and Kingdom War |
| Workshop equipment on your leader | Castle stats from forged gear. They count only while your leader hero can fight (not captured or dead). | Trophies and gear |
Timed items
Section titled “Timed items”| Item | Effect | Time |
|---|---|---|
| Attack Boost 20% / 50% | Army attack +20% / +50% | 12h or 24h |
| Defense Boost 20% / 50% | Army defense +20% / +50% | 12h or 24h |
| Upkeep Reduction 25% / 50% | Troop upkeep −25% / −50% | 24h or 7 days |
| EXP Boost 25% | Lord EXP +25% | 24h |
| Hunt ATK Boost 25% | Monster hunt attack +25% (monster hunting is off on production today) | 24h |
- Attack Boost and Defense Boost cancel each other. Using one removes the other one if it is running.
- Different kinds run together. Only Attack Boost and Defense Boost are linked this way. Anti Scout, Scout False Info, Upkeep Reduction and EXP Boost are separate effects, so each can run at the same time as an Attack or Defense Boost.
- Same-kind items do not stack. An item that is weaker or shorter than the one running is refused; an equal or stronger one replaces it and restarts the timer. See Troop upkeep.
Kingdom titles
Section titled “Kingdom titles”The Overlord hands out Vassal Titles. A title changes the stats of the player who holds it. Values on production today, same in every kingdom:
| Title | Effect |
|---|---|
| Overlord | Army attack, defense and HP +15% |
| Supreme Commander | Army attack +15% |
| Valiant Cavalry General | Cavalry attack +20% |
| Great Infantry Commander | Infantry HP +20% |
| Siege General | Siege defense +15% |
| Fortress Lord | Wall HP +15% |
| Chief Drillmaster | Training speed +10% |
| Imperial Healer | Healing speed +10% |
| Master Strategist | Forging speed +10% |
| Traitor | Infantry HP −15% |
| Scoundrel | Army attack −5%, infantry HP −10% |
| Coward | Wall HP −10%, ranged attack −5% |
| Trembling Knight | Cavalry attack −5%, siege attack −10% |
| Sloth | Training speed −5%, infantry attack −5% |
| Dullard | Research speed −5%, march speed −5% |
| Bungler | Forging speed −5%, march speed −5% |
| Forager | Food production −10%, march speed −5% |
| Quack | Healing speed −10% |
| Miser | Gathering speed −15% |
Good to know
Section titled “Good to know”- The Bank gives boosts too. Your deposits earn points, and each Bank rank adds a percentage to army attack, defense and HP, resource production and more. See Buff ranks.
- March size has its own page: How many troops can I send?.
- A boost that ends (an item running out, a War Chest tier drop, losing a title) is removed from the sum at once.
Where can I see my boosts?
Section titled “Where can I see my boosts?”Open Boost & Stats from your profile, then the Boost tab. It lists your bonuses in groups (for example Economic), with two columns:
- Base Stats: bonuses active now.
- With Leader: the same plus leader-only gear, when your leader hero is deployed.
Rows with no bonus are hidden. The Stats tab is different: it shows your player statistics, including Might.
If you see “Could not load boost stats.”, tap Retry. If a boost shows 0% while you know it is active, close and reopen the game and look again. If it is still wrong, contact support with a screenshot.
Why did my attack drop after I used a boost item?
Section titled “Why did my attack drop after I used a boost item?”An Attack Boost and a Defense Boost cannot run together. Using one switches off the other one, and the boost that was running is not refunded. If you use a Defense Boost while an Attack Boost is running, your army attack goes back down. An Attack Boost that is weaker or shorter than the one running is refused. An equal or stronger one replaces it and restarts the timer.