There are four Class Quests in Path of Terraria, each focused on a certain class and a certain NPC in Ravencrest. They are the first quests the player can do, awarding the player with a class-respective ability, a few class items, and experience.
At least one of these quests must be completed for Garrick to appear, and allow further progression with the questline.
Each quest concerns a given NPC, and repairs a major building in Ravencrest. They are as follows:
Elara the Hunter: Drawing the Bow - Ranger
Thrain Ironfist the Forgemaster: Forging a New Blade - Melee
Alaric the Wizard: Magical Returnal - Magic
Morgana the Witch: The Ancient Art - Summoner