This guide will have a guideline for what to invest your resources into.
The goal is to prioritize 1 mob killer for story, while preparing 1 physical and 1 magic boss killer for BFL/DZ.
At most, characters should only be level 80. Level 90 is extremely expensive.
Lv20 p1 Wendy, level 3 ult
Lv20 p1 rest of the team
Lv40 p2 Wendy, level 5 ult
Lv40 p2 Nox, level 7 ult. Replace Wendy with Nox (should take 1-2 weeks to get Nox from New Chief Assessment)
Lv40 p2 rest of the team
Lv55 all teammates
Should be in ch8+, mid or high BFL
Lv70 p3 Nox
Lv70 p3 Luvia
Phase 0 Sinner: Cannot level skills.
Phase 1 Sinner: Unlocks level 3 skills.
Phase 2 Sinner: Unlocks level 7 skills.