Upgrade Grit Charm through four ranks and it tops out at Heroics Lv4. The first rank costs 1,500z to craft, every rank after that is an upgrade. Some of the materials only come from Gravios, Guardian Doshaguma, Jin Dahaad and three more monsters.
Rank by rank
Grit Charm IRarity 4
Heroics Lv1: Defense +50 while active.
Craftable · 1,500zGrit Charm IIRarity 6
Heroics Lv2: Attack +5% and defense +50 while active.
Upgrade from previous rank · 6,000zGrit Charm IIIRarity 7
Heroics Lv3: Attack +5% and defense +100 while active.
Upgrade from previous rank · 9,000zGrit Charm IVRarity 8
Heroics Lv4: Attack +10% and defense +100 while active.
Upgrade from previous rank · 16,000z