At the middle to late game it's the most prized resource that gates your progress. Below are reference tables on how many you need to upgrade your gears!
Keepsake/Insignia
Rank
SAC
0 > 1*
1
1 > 2*
2
2 > 3*
4
3 > 4*
8
4 > 5*
16
5 > 6*
24
Total
55
Gears (Orange)
Rank
SAC
0 > 1*
2
1 > 2*
4
2 > 3*
8
3 > 4*
16
4 > 5*
24
5 > 6*
32
Total
86
Buff Gears (Orange)
Rank
SAC
0 > 1*
2
1 > 2*
4
2 > 3*
8
3 > 4*
16
4 > 5*
24
5 > 6*
32
Total
86
Talent Sigil
Rank
SAC
Talent T1 Sigil
3 (x1 slot)
Talent T2 Sigil
6 (x2 slots)
Talent T3 Sigil
15 (x3 slots)
Total
60
WHERE DO I GET MORE SACS!
Monthly daily login reward - 2 (at 14d mark)
Weekly Purchase:
Peak Arena - 2 (2000 points each)
World Disaster - 1 (10 golden pearls)
Fortnightly Purchase: Apex Clash - 3 (150 golden badges each)
Event prizes
Chance to get when using gear ticket at supply depot (Save and use during SAC Rate-up!)
Exchange at supply depot (24 supply coins)
Certain mall packs but those are usually using money and are expensive
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