Room masters: a strong monster that would be a challenging encounter for a full party of intruders of equal level, in order to defeat this they'd have to utilize their strongest abilities. This boss empowers all monsters in the room making the room even more deadly. only 5 of these per sectors may exist

Stalker: As strong as the room master but roams around a sector. More deadly than a room master as it can catch weak or unprepared intruders only one per sector may exist (This boss was implemented in the Roaming update: update 1.1)

Teaser: Secluded master: Classified. (The secluded master is not implemented yet) Spoiler: 

This is the Room master equivalent of the secret sector, it is twice as strong and empowers the room as normal. 10 of these may exist instead of 5. (this boss will be implemented in the Secret sectors update)

Sector lord: This boss is challenging for a half raid of equal level intruders the recommended number of intruders to fight this boss is 12 equal level intruders. This boss empowers all monsters in the sector. only one per sector may exist

Teaser: ??? Spoiler: 

 This boss does not yet have a name It is planned for the Evolution update

Predator: This boss roams around like the stalker but is not limited to a sector but is limited to a floor. this boss is sought out to be slain by intruder raids as the danger it poses can easily kill groups of intruders if caught unaware, this boss requires a half raid to slay meaning even full groups of intruders, unless they have a death wish, will try to run away. Only one may exist per floor (This boss was implemented in the Roaming update: update 1.1)

Teaser: Concealed Lord: Classified. (The Concealed Lord is not implemented yet) Spoiler: 

The Concealed Lord is the Sector lord equivalent of the secret sector but will require at least 18 equal level intruders. This boss like the sector lord empowers all monsters int he secret sector. two of these may exist in the secret sector. (this boss will be implemented in the Secret sectors update)

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Floor guardian: This boss is challenging for a full raid of equal level intruders the recommended number of intruders to fight this boss is 24 equal level intruders. this boss empowers all monsters on the floor and seals the entrance to the next floor preventing intruders from continuing further until slain. this boss is one of 2 found in first generation dungeons

Teaser: Phantom: Classified. (The Phantom is not implemented yet) Spoiler: 

The phantom is equally powerful to the floor guardian and like the floor, guardian seals the entrance to the next floor. this boss is another roaming boss however unlike other roaming bosses who actively seek out intruders this boss does everything it can to avoid battle and must be cornered. However, if confronted with a force it has no chance of losing against this boss will fight but will not chase if intruders retreat from the fight. This boss may be the most frustrating as it is difficult to corner as it knows dead ends and avoids them. only one per floor may exist. (this boss will be implemented in the Secret sectors update)

Teaser: Hidden Guardian: Classified. (The hidden guardian is not implemented yet) Spoiler: 

This boss is the equivalent to the floor guardian except stronger, it empowers the secret sector only and does not seal the next floor the recommended number of equal level intruders is 30.

Dungeon Champion: This boss is much stronger than the floor guardian requiring at least 36 equal level intruders to slay It does not empower monsters. only one may exist in the dungeon

Spoiler: Spoiler

in the Worlds update, the Dungeon champion will instead seal the next part of the dungeon instead of being the final boss.

Teaser: World Protector: Classified. (The World Protector is not implemented yet) Spoiler: 

the World protector will be a sole boss of a new area past floor 11 (this boss will be implemented in the Worlds update)

Emergency protocol 9: By the order of Dungeon Delvers Guild all knowledge of emergency protocol 9 has been forbidden. No one may know the shameful history of the DDG.