Price the recovery before the battle
Theria Games’ Source of Life calculator uses this planning formula:
Estimated Source of Life = dead troop power ÷ [50,000 × (1 + total applicable revival buffs)]
Enter revival buffs as decimals in the formula: 100% becomes 1.00. Use the power of troops that may require SvS revival, not total keep power. Include only buffs that are active and apply to this recovery.
The formula is specialist guidance, not an official Evony rule published by Top Games. Treat the result as an estimate and confirm it against your current Revive screen before relying on it.
A worked loss budget
Hypothetical example, not a prediction of battle losses.
| Total revival buffs | Calculation | Estimated Source of Life |
|---|---|---|
| 0% | 600,000,000 ÷ 50,000 | 12,000 |
| 100% | 600,000,000 ÷ 100,000 | 6,000 |
| 200% | 600,000,000 ÷ 150,000 | 4,000 |
In this example, raising applicable revival buffs from 100% to 200% reduces the estimate by 2,000 Source of Life. It does not make the hit cheap. It makes one part of recovery less expensive.
The buff is helping. It has declined to sponsor the entire battle.
Turn the reserve into a risk ceiling
Maximum troop power at risk = spendable Source of Life × 50,000 × (1 + total applicable revival buffs)
Spendable means current inventory minus the amount you refuse to use. Set that protected reserve before the battle. The Revive screen is a poor place to discover optimism.
Worked reverse budget: protect 2,000
Hypothetical example. You own 8,000 Source of Life and protect 2,000 for a second loss. That leaves 6,000 spendable.
| Total revival buffs | Maximum troop power at risk |
|---|---|
| 0% | 300,000,000 |
| 100% | 600,000,000 |
| 200% | 900,000,000 |
At 100%, the 6,000 spendable reserve supports an estimated 600,000,000 troop power. A 600,000,000 loss from the earlier example would consume the spendable amount and leave the protected 2,000. That is the ceiling, not a target.
The budget has now approved exactly one disaster. It remains unenthusiastic.
Apply the ceiling before the hit
Check current inventory and subtract the protected reserve. Confirm total active applicable revival buffs in the current game screen. Calculate the ceiling, then compare it with the troop power actually exposed in the march, reinforcement or defense. If exposed power is above the ceiling, reduce the troops at risk, improve the verified buff or decline the hit. Do not count items you hope to buy or farm later. Round the decision down, not the confidence up.
This ceiling inherits the same uncertainty as the specialist formula. Real losses may involve multiple recovery systems, and the active Revive display remains final. It is a planning guardrail, not a guarantee that all exposed troop power will die or require the same recovery.
Evidence reviewed 2026-09-23. Theria still presents its calculator as an estimate for full recovery from a zero or for particular marches. The reverse ceiling is arithmetic derived from that specialist model, not an official Evony rule or an independently controlled test.
Check Hospital headroom before defending
Hospital headroom = displayed wounded capacity − current wounded occupancy − protected buffer
Use the live Hospital numbers. Headroom counts troop quantity, not troop power. Choose a buffer for a second hit or an existing healing queue, then compare the remainder with wounded counts from a genuinely comparable report.
Worked headroom example
Hypothetical example. Displayed wounded capacity is 8,000,000, current wounded occupancy is 1,500,000, and the protected buffer is 1,000,000.
Spendable Hospital headroom
8,000,000 − 1,500,000 − 1,000,000 = 5,500,000 wounded troops
This does not mean a march of 5,500,000 is safe. Battle mode, attacker, buffs, troop mix and loss routing decide how many become wounded, dead, deserters, souls or damaged siege. Use the headroom only as a stop line against a comparable result.
Hospital capacity is generous until it is asked a second question.
Before accepting a defense, empty avoidable wounded if practical, confirm displayed capacity with current duty officer and active bonuses, keep the buffer, and compare the remaining headroom with recent comparable reports. If the first plausible outcome uses most of it, the second hit already has an opinion.
Evidence reviewed 2026-09-24. Theria’s August 8, 2026 Hospital guide says upgrades increase wounded capacity, the Heal menu is unavailable while the Hospital is upgrading, and SvS temporarily adds 50% capacity. It also lists research, the Hospital duty officer, some defense-general effects, the Dragon of Thebes and a Monarch Talent among capacity sources. This is specialist guidance, not an official Evony rules page. Confirm the live display; no universal wounded percentage is assumed.
Use the right recovery system
- Hospital: heals wounded troops. Upgrading it increases wounded capacity. The Heal menu is unavailable while the Hospital itself is upgrading.
- Trap Factory: repairs damaged siege machines. Do not count siege repair as ordinary Hospital healing.
- Holy Palace: recalls Deserters and revives troops that became Souls. The specialist guide places Soul revival at Holy Palace level 25 and Duty Officer access at level 35.
- SvS Revive: handles Server War revival and can consume Source of Life as losses increase. Check the live screen because buffs, available items and recovery conditions can change.
These systems overlap in the general category called “things I now regret,” but they do not use one shared queue or one shared cost.
Decide before the second hit
- Record the troop power at risk from the march, reinforcement or defense you are considering.
- Add only the applicable revival buffs you can verify in your account.
- Calculate the estimate, then compare it with your current Source of Life inventory and the in-game Revive display.
- Keep a separate reserve for an unexpected second loss. If the numbers do not fit, ghost more troops, change the defense, choose a smaller risk or stay bubbled.
A 2023 player discussion describes a zeroed account scrambling to farm or buy enough Source of Life before recovery closed. The reported bosses, drops and shop prices are old and may not be current. The useful evidence is narrower: a large loss can create an urgent inventory problem. Do not wait for the urgent part to begin the calculation.
Sources: Theria Source of Life calculator, Theria Hospital guide, August 8, 2026, Theria Holy Palace guide, official July 31 Holy Palace Officer set announcement, and older player recovery discussion. The official announcement confirms the equipment-set addition, not the calculator formula. No independent current controlled test of the formula was found.
Count the power.
Count the reserve.
Let bravery submit a budget.
— 
Kat
Reviewing the revival plan. The confidence was fully developed.