The Barbarian King is the first Hero unlocked at Town Hall level 7. He is a larger, stronger, more aggressive, more impressive, and more powerful Barbarian.He is automatically summoned once the Barbarian King Altar is constructed, which costs 5,000 Dark Elixir.The Barbarian King is an immortal unit (since he is a hero), so he only has to be summoned once. However, if he is injured or gets defeated in an attack, he must regenerate his health by sleeping for a period of time before he can be used again. The maximum period needed for him to regenerate depends on his level; the higher it is, the longer it takes for him to regenerate.