Fou Guide for Fate/Grand Order (FGO). Learn how to use Fous, their stat boost amounts, usage priority, and where to obtain them.
Table of Contents
How to Use Fous and Usage Priority
Used in Servant Enhancement

Fou Cards, also known as Fous, are used in the Servant Enhancement menu. You can sort and filter to use Fou Cards instead of EXP Cards. Fous also have Classes, and unless they are the "ALL" Class, they can only be used on Servants of a specific Class.
Boosts HP and ATK Stats of Servants

Fous boost the HP and ATK stats of Servants. ★1 to ★3 Fous enhance stats from 0 to 1000, while ★4 Fous are for enhancing from 1000 to 2000.
Fou Enhancement Amount Per Rarity
| Rarity | Stat Boost | Usage |
|---|---|---|
| ★1 | +10 | For 0~1000 |
| ★2 | +20 | For 0~1000 |
| ★3 | +50 | For 0~1000 |
| ★4 | +20 | For 1000~2000 |
Fous Needed is Fixed and Doesn't Benefit from Bonuses
Fou enhancement doesn't benefit from Great or Super Success bonuses, so the number of Fous required for stat boosting is fixed. You'll need 20 ★3 Fous for a 0 to 1000 stat boost, and 50 ★4 Fous to boost stats from 1000 to 2000.
Usage Priority for Fous
ATK for Attackers, HP for Survival
If you have a limited number of Fous, prioritize using ATK Fous on your Attackers (both ST and AoE). Use HP Fous on Servants you want to keep alive longer, such as those for difficult boss fights or for stalling.
★4 Fous for Most Used Servants
Since ★4 Fous are limited and can only be accumulated slowly, you should save them for your most frequently used Servants.
How to Obtain Fous
- Exchange at Da Vinci's Workshop
- Rewards from Limited-Time Events
- Rewards from Extra Missions
- Obtain from the Friend Point Gacha
Exchange at Da Vinci's Workshop

Mana Prisms are easier to obtain by selling ★3 cards (Servants, CEs, or EXP cards) or from event rewards, so it's recommended to regularly exchange for the ★3 Fous. Rare Prisms, on the other hand, are harder to obtain since you need to sell ★4 or ★5 Servants to get them.
| Item | Cost | Exchange Amount |
|---|---|---|
| ★3 Fou (HP) | Mana Prism ×15 | 20 pc. |
| ★3 Fou (ATK) | Mana Prism ×15 | 20 pc. |
| ★4 Fou (HP) | Rare Prism ×3 | 1 pc. |
| ★4 Fou (ATK) | Rare Prism ×3 | 1 pc. |
The ★3 Fou stock resets on the 1st of every month, while the ★4 Fou stock resets on the 15th of every month.
Limited-Time Event Rewards

Events are a consistent source of Fous. Event Shops typically stock 20 ★3 Fous and 2 ★4 Fous for both HP and ATK. Additional Fous can also be earned from event missions and quests.
Rewards from Extra Missions

You can also get Fous by clearing Extra Missions. Since there are many Extra Missions, you can scroll down to check which ones offer Fous as a reward and prioritize clearing them.
Obtainable from Friend Point Gacha

Aside from being the main source of Craft Essences for enhancement, the Friend Point Gacha also provides ★1~★3 Fous.
Tip! | Since ★3 and lower Fou cards are easy to obtain this way and cost very little QP, feel free to use them on your Servants. |
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