Mana

Mana is the player's magical energy in Terraria. It is used to operate magical accessories and weapons. You start the game with zero maximum mana, but your total can be increased by collecting fallen stars and combining 10 of them into Mana Crystals, which increase your maximum mana by 20.

Player can regenerate mana in a few ways: letting it naturally fill, consuming certain foods, mana potions, fallen stars, wearing a Band of Starpower, which increases mana regeneration rate, by equipping a piece of Meteorite or Cobalt Armor. Natural mana regeneration won't regenerate mana until about 1 second after use, however items that regenerate mana will do so even while you use mana.

Each blue star represents 20 mana. Players can have up to 200 mana.