City of Heroes required the creation of a character in order to enter the virtual world and progress through the game. After creating a character and selecting a name (the game would check if the name was already taken on the server), players could either begin play in an isolated tutorial zone, or skip the tutorial and begin in an open low-level zone. A character's level increased by earning experience points from defeating foes, completing Missions, and exploring Zones, then returning to one of various named NPCs known as Trainers. Benefits for rising in level included more Health, more Powers to choose for the character, more slots to allocate Enhancements to Powers, and larger inventories for Inspirations (quick use items) and Salvage (crafting materials). If a player lost all of their Health they were temporarily considered defeated, at which point they could be revived through use of an item, by an ally's powers, or by instant teleportation to Hospitals on the map. After reaching character level 10, a player defeat would accrue Experience Debt which temporarily made gaining additional experience more difficult.