Certain quests, that are marked out, may be locked or unlocked by saving /sacrificing Archfiends indicated by the arrows in the menu. To unlock this pact, you need to fight Magusar, and win the fight.
Sacrificing the Avaricious Slime
Saving the Avaricious Slime
Sacrificing the Cyclops
Saving the Cyclops
|I. Innocence· II. Desire · III. Reparation · IV. Atonement · V. Envy · VI. Pride · VII. Judgment · VIII. Remorse ·|