The Advanced Custom is a mechanic that is implemented in June 2nd 2021 and is primarily used to reroll a Mobile Suit’s passive ability.
When you build a Mobile Suit, it will be built with 1 of its 3 available passive abilities.
Your Mobile Suit must be built from a gold blueprint to be usable for Advanced Custom. This also gives it a Level 3 passive straight away.
Each suit has its own set of passives.
You can view all 3 of the available passive abilities on the suit’s information page.
To access the Advanced Custom menu, go to your Mobile Suit in your hangar and click on the 6th button from top.
To apply an Advanced Custom once, you will need the following materials:
20 Silver Blueprints of the MS involved
OR
1 Gold Blueprint of the MS involved
OR
50 Master Memory
AND
10 Custom Kit (20 for AC2 to AC3)
After applying, you will see the new passive unlocked for your suit, you can view and change the passives unlocked whenever you like as well.
After applying an Advanced Custom, your suit also gains 2 extra upgrade slots, so you can have 4 extra slots total if you fully unlock your Mobile Suit’s passives.
Finally, you can also see the number of Advanced Customs performed besides the name of your suit.