The effective level link cap is 425

Permanent SRs: 22 Rs: 12 Arcana: 15 Total: 185 So, 425 is the effective max level. If equipment's effective max is also 420, Satan requires a cumulative 565 parts (38 scrolls or grimoires per slot). Michael requires a cumulative 560 parts (24 materials). Let's consider Michael complete at level 330 (cumulative 290 parts), just before the part requirement jumps to 30. Each slot needs 12 materials. For full Metatron, that's 60 materials (1875 pulls for 50 pulls standard = 562,500 diamonds). Requires 32 Ultra Sale packs for Trust 60 (377,600 yen). Full Satan 420 needs 2825 parts (76 scrolls, 114 grimoires). For 5 main characters, that's 380 scrolls and 570 grimoires. Gacha 10-pull expected value is 1.2 + 0.5 respectively. Assuming completion at 380 of each, that's 2236 pulls (670,800 diamonds). Requires 38 Ultra Sale packs for Taboo 60 (approx. 450,000 yen). If all distributed diamonds are used, completion in 4-6 years...? Outside of main attackers, equipment enhancement benefits are less significant, and accessories (head/body) have lower priority, so it should actually cost fewer diamonds (considering characters and exclusive weapons, armor will likely involve some compromise).