When you create a sidekick, you choose the class it will have for the rest of its career: Expert, Spellcaster, or Warrior. If a sidekick class contains a choice, you may make the choice or let the players make it. ### Starting Level The starting level of a sidekick is the same as the average level of the group. For example, if a 1st-level group starts out with a sidekick, that sidekick is also 1st level, but if a 10th-level group invites a sidekick to join them, that sidekick starts at 10th level. ### Leveling Up a Sidekick Whenever a group's average level goes up, the sidekick gains a level. It doesn't matter how much of the group's recent adventures the sidekick experienced; the sidekick levels up because of a combination of the adventures it shared with the group and its own training. ### Hit Points Whenever the sidekick gains a level, it gains one Hit Die, and its hit point maximum increases. To determine the amount of the increase, roll the Hit Die (the type of die appears in the sidekick's stat block), and add its Constitution modifier. It gains a minimum of 1 hit point per level. If the sidekick drops to 0 hit points and isn't killed outright, it falls unconscious and subsequently makes death saving throws, just like a player character. ### Proficiency Bonus The sidekick's proficiency bonus is determined by its level in its class, as shown in the class's table. Whenever the sidekick's proficiency bonus increases by 1, add 1 to the to-hit modifier of all the attacks in its stat block, and increase the DCs in its stat block by 1. ### Ability Score Increases Whenever the sidekick gains the [[Ability Score Improvement]] feature, adjust anything in its stat block that relies on an ability modifier that you increase. For example, if the sidekick has an attack that uses its Strength modifier, increase the attack's modifiers to hit and damage if the Strength modifier increases. If it's unclear whether a melee attack in the stat block uses Strength or Dexterity, the attack can use either.