↑For Slot 1 32 Luck is needed for 5x Nightmare Fur. For Slot 2 32 Luck is needed for 5x Nightmare Horn. For Slot 3 ? Luck is the cap for S grade Quests. For Slot 4 ? Luck is the cap for S grade Quests.
↑Lowest number is chance to drop for D grade Quest result. Highest number is for S grade Quest result.
The base chance for a Rare mob is 10%, but the chance to be rare next time depends on Quest grade.