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The best way to get Baby Mouse Insignias is to farm Unrecorded History Stage 11. Spider Nest, as you can also buy them from the Side Story AP Exchange Shop located there.
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Stages That Drop Baby Mouse Insignias
Map Zone
Chapter/Episode
Availability of Baby Mouse Insignias in the Exchange Shop
11. Spider Nest (Best Source)
Side Story
Epilogue (Unrecorded History)
Available
3-2
3-3
3-8
3. Savara World
Episode 1 (Heir of the Covenant)
Available
3-S1
3S-2
3S-3
3S-4
3. Farche Frontier World
Episode 1 (Heir of the Covenant)
Available
4-3
4-4
4-1. Solayu Swamp World
Episode 1 (Heir of the Covenant)
Not Available
4-S7
4-2. Solayu Forest World
Episode 1 (Heir of the Covenant)
Not Available
5S-2
5S-5
5S-S1
5S. Sun Desert World
Episode 1 (Heir of the Covenant)
Not Available
7-S1
7-S4
7-S5
7. North Wetheric Moor World
Episode 1 (Heir of the Covenant)
Not Available
Participating in Events can also help you earn Rare Catalysts like Baby Mouse Insignias whenever they are held.
Finally, you can visit your Guild to either purchase Catalyst Chests from the Member Shop or request Catalysts themselves via the Guild Aid System.
The best place to farm Baby Mouse Insignias is Stage 11. Spider Nest, which is located in the Unrecorded History Side Story.
There, you’ll also be able to farm lots of fodder (Lvl. 40+) equipment and a few Mercenary’s Medicine if you’re lucky.
Unrecorded History (AP Exchange Shop)
You can buy up to 20 Baby Mouse Insignias per week for 120 AP each from the AP Exchange Shop located here. This should be your main source of Catalysts when farming Adventure stages.
If you want to reduce the amount of grinding you have to do, remember to equip a Pet that increases your AP acquisition rate when Auto-Repeating this stage!
Method #2: Participate In Events
E7 x Aespa Event (Reputation Rewards)
Events either give away free resources or allow you to grind for them manually by buying them from the Exchange Shop with farmable Event currencies.
Catalysts, especially Rare Catalysts, are commonly featured as Event rewards, so make sure you participate in as many Events as you can to farm all the Catalysts you need.
There are also Pets that can boost your acquisition rate for Event Currency. Remember to equip them before clearing or Auto-Repeating Event Stages for Event currencies!
Method #3: Visit Your Guild
Guild Member Shop
The Guild Member Shop allows you to buy up to 5 Rare Catalyst Chests and 3 Catalyst Chests every week, where you can potentially get Rare Catalysts like Baby Mouse Insignias from.
Guild Aid (Baby Mouse Insignia)
If you want a more convenient way to get Rare Catalysts, you can also request up to two Rare Catalysts from your guildmates once per day via Guild Aid.
Just remember to give back some of your extra Catalysts once in a while. This way, your guildmates will be more receptive to donating more materials to you in the future!
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