Horizon Forbidden West's sidequests are separated into two categories: Side and Errands. As if the game doesn't already have more than enough activities to do, completing these will earn players XP, Skill Points to use in the skill tree, and sometimes, powerful new weapons to add to Aloy's machine-killing arsenal. In the town of Chainscrape, players can find a new Errand called "A Bigger Boom" once the shops and merchants open up after the story mission "To the Brink" has been finished.