World boss This page contains a short overview of all world bosses in game , including those that were nerfed , removed , or just not updated for the level cap . These bosses are considered raid bosses since it takes more than a party of 5 players to down them . Blizz ard seems to have lost interest for a time in the idea of world bosses as none had been added between the Burning Crusade expansion and Mists of Pandaria . Spawn rates . Some people have roughly estimated their spawn rates : Initial spawn : Respawn : Server crashing or going down counts as that world boss having been killed , and starts its respawn timer Old spawn trivia . At the time of the testing , / used to spawn a little earlier than the world dragons . The dragons spawn one unique per the 4 spawn locations , typically all at the same time . One continent being down without the other desyncs the dragons , possibly making them spawn duplicates . ( Thus occasionally spawning 2 of exactly the same bosses in different locations ) . History of World Raid Bosses . Originally , and were added early in " World of Warcraft " . They were two of the game ' s greatest promotions of intra - guild cooperation and inter - guild rivalry , as killing them required tracking their spawn , forming a raid , beating the encounter , AND the opposing faction ( and at times same faction griefers ) . Their loot was also among the best at the time of their popularity . Shortly before the Ahn ' Qiraj event , the four Dragons of Nightmare were created , and added an entire new round of World Raid bosses . They were initially killed for having the best items for their slots , and later farmed for their nature resistant gear when it became apparent that some Temple of Ahn ' Qiraj encounters required it . They were also involved in the Scepter of the Shifting Sands green piece questline . As time passed , and Naxxramas came out without accompanying world raid bosses , the popularity of the world raid bosses began to fade . With patch 2 . 0 , began to terrorize Azeroth , in place of Lord Kazzak ( and his Azeroth loot table ) . After the Burning Crusade came out , two new world raid bosses were introduced , Doom Lord Kazzak and ( there were others initially shown in databases as ? ? bosses , including a rare spawn from a quest in Blade ' s Edge in which you can spawn a raid boss who flies away , but is unaggro - able . But currently it is accepted that there are 2 BC world raid bosses ) . The popularity of the two was short - lived . After a couple months it became apparent that loot off of Karazhan was on par or better , while not having the additional faction vs . faction griefing factor . In Patch 2 . 2 , world bosses were often left untouched for long periods of time . There were occasional guilds that use them as either practice for raiding , or under - geared guilds trying to gear up . But with a couple of announcements by blue post that they did not plan to add additional world raid bosses , the days of a new world raid boss came to an end . Blizz ard did not add any world raid bosses for Wrath of the Lich King or Cataclysm . Outdoor bosses . In some rare elite s were added that were more like outdoor dungeon bosses that usually required a good 5 - man group or more to kill and loot . They technically were not raid bosses , but the closest since Burning Crusade to a world boss . Dragons of Nightmare . These world bosses were removed from the game in Cataclysm . One of the Four Dragons corrupted by the Nightmare , Emeriss is a gruesome , rotting monstrosity . Along with her AoE Sleep , she also casts a disease which damages nearby allies , and turns the corpses of the dead into deadly mushrooms . And every 25 % , she casts Corruption of Earth , a Shadow DoT that deals 100 % damage to the players health over 8 seconds . < br clear = " right " > One of the Four Dragons corrupted by the Nightmare , Lethon has become exceedingly evil , enough so to darken the hue of his scales , and his eyes have also been forced open , an oddity amongst Green Dragons . He has a massive Shadowbolt Volley , and every 25 % he extracts shades from his enemy that will heal him . < br clear = " right " > One of the Four Dragons corrupted by the Nightmare , Ysondre ' s once beneficial healing powers have given way to dark magics . Casts an AoE Lightning Wave that deals direct Nature damage , and summons fiendish Druid s every 25 % . < br clear = " right " > One of the Four Dragons corrupted by the Nightmare , Taerar was perhaps the most affected of Ysera ' s lieutenants . His corporeal form has been shattered and he exists as a specter . Has an AoE Fear , and creates 3 Shades of himself every 25 % . < br clear = " right " > Others - Eastern Kingdoms and Kalimdor . As of Cataclysm , Azuregos is not a real world boss , but more of a curiosity . He was not technically removed , but does not give a chance for loot drops . A mighty blue dragon who resides in the wilderness of Azshara , perusing over the countless magical artifacts there . He randomly teleports himself and all players within 30 feet a short distance , wiping aggro , casts a blizzard - like spell that eats mana , and occasionally puts up a magic reflection shield . Also , in order to prevent graveyard - zerging , he places a debuff on players that he kills . Any living players with this debuff will freeze whenever they go near him . < br clear = " right " > Highlord Kruul is a doomguard boss who appears in various parts of Azeroth during the Dark Portal Opens event , introduced in patch 2 . 0 . 3 . After the Dark Portal reopened , he officially replaced Lord Kazzak ( now Doom Lord Kazzak in Outland ' s Hellfire Peninsula ) as the Burning Legion ' s field commander in Azeroth , residing in the Tainted Scar in the Blasted Lands , southwest of the Portal . He has since been removed from the game as of the release of The Burning Crusade . As of Cataclysm , Teremus is not a real world boss , but has been converted to a rare mob , so still drops some decent loot for lower level characters . Teremus was an immensely powerful black drake found in the Blasted Lands . He had an AoE Lifesteal , and wipes aggro when he uses a knockback attack . When he gets down to 20 % health , he regenerates to full health , making him one of the most difficult and prolonged fights in the game . He used to be a popular target for the makers of machinima , most frequently being kited by a hunter and a priest from the Blasted Lands to Stormwind or Ironforge , but as of some past patches , he is now chained to the Blasted Lands and will leash back when a player tries to kite him out of the zone . < br clear = " right " > Event / Quest - Eastern Kingdoms and Kalimdor . Omen is a demon boss summoned in the Moonglade during the Lunar Festival . Others - Outland . Former commander of the Burning Legion forces in the Blasted Lands , the former - Doomguard , now crowned Doom Lord Kazzak , awaits with his formidable troops for the heroes of Azeroth to challenge his reign as Commander of the Burning Legion in Outland . He consumes the soul of all beings he slays to heal himself , casts a curse on players that makes their mana pools combust and if he isn ' t killed in 3 minutes , goes into his " supreme mode , " allowing him to completely obliterate everything in his path . Doomwalker is a powerful Fel Reaver sent by Kil ' jaeden to assault the gates of the Black Temple in Shadowmoon Valley . He ' s a clear reminder for Illidan that Kil ' jaeden hasn ' t forgotten about him . . . Others - Pandaria . This is actually a group of bosses , one of which is the colossal mushan , , and are led by the saurok , . A massive sha that appears in various locations around southeastern Kun - Lai summit . A cloud serpent who guards one of the entrances to the Throne of Thunder . Introduced in Patch 5 . 2 . A strange and huge bipedal lizard adorned with baroque stone armor . Introduced in Patch 5 . 2 .