402px-Baron Charr

"Where are the so-called heroes of this world? Too frightened to come out and play?"

Baron Charr is a rogue fire elemental and a villain from World of Warcraft who leads the Blazing Invaders on periodic assaults on Un'goro Crater, emerging from the volcanic Fire Plume Ridge in order to, in his own words, "burn the land of its impurities".

Although quite powerful Baron Charr is far from immortal and adventurers can track him down and defeat him in order to stop his invasion, however Baron Charr can not permanently die (or so it would seem) as he will return periodically as part of the Elemental Invasion event (though this may be down to game mechanics other than actual lore (such as how many raid bosses can be faced again after being "slain" by players beforehand).