Allure is Primrose's Path Action in Octopath Traveler, and one of two that can be used in the first demo of the game. The ability allows Primrose to allure certain non-playable characters in the game, and lead to them to various locations. This Path Action is the rogue counterpart to Ophilia's Path Action, Guide.
When choosing to allure an NPC, you will be presented with a chance of success. The more powerful the NPC is in battle, the lower your chances. If the action is successful, the NPC will begin to follow Primrose and will walk behind her. If the action fails, your reputation in the town you are currently in will decrease.
When in combat, a 'Support' option becomes available. When used, the allured NPC enters the battle and every turn, after Primrose's turn, will attack with either their standard attack or their special skill. When the enemy attacks, they have a chance to attack the support instead of your characters. After a given amount of attack turns or upon defeat, they will leave the battle, but will continue to follow the player.
Outside of combat, this path action can also be used to progress the plot or certain side quests by luring certain NPCs to certain locations (such as luring a rich patron to a bar). If at any point the player does not want the NPC by their side anymore, they can press 'Y' to part ways with them. Primrose can have only one follower at any given time. If you try to allure a second, you'll have to part ways with your current follower.