Eros Eruption ULTIMATE | South Park: The Fractured But Whole (Tweek & Craig Ultimate)
To unlock the secret Ultimate “Eros Eruption” for Tweek and Craig in South Park: The Fractured But Whole, you have to complete two side quests.
The first is called “Ghost Reconciler” at Tweek Bros Coffee shop. After it is completed you have to wait a while until the new sidequest “Therapy Wars” pops up at the elementary school.
Join the battle there until Tweek and Craig unlock their new ultimate called “Eros Eruption”. After finishing the battle, this new ultimate can be used by either Tweek or Craig in the future.