Dreadnaut is a boss monster encountered on the Warped floors. This boss requires a Dungeoneering level of 95 to encounter and fight.
Dreadnaut is in fact the captain of the Rammernaut guard, Hoskins, except he is corrupted by the tainted magic that affects the Warped floors due to their closeness to The Rift. He appears to have grown a lump in the back and had his shield transformed into an eye.
His melee attack will be followed by a ranged attack a tick later, which will be fired at multiple players.
His special attacks consists of him spawning orange blobs on the ground. They stay for a while and cause damage if stood on, and also drain prayer rapidly. He can point his shield at a player and emit a red beam, dealing typeless damage and disabling protection prayers and deflection curses.
Running around the room while using magic is not as safe as it may seem. After a while he shouts "You can't run forever!" and lowers your magic level with a multi-target steam attack.
The examine text seems to indicate that Dreadnaut is under the mind-control of a stalker, similar to the way sea slugs control minds. Or, more likely, it could be referring to his shield, which has mutated into an eye.
In Dreadnaut's room, if a player looks in the map the ladder has the red lines of a door rather than a ladder.
Sometimes before fighting Dreadnaut, there are two level 117 Brutes standing nearby trying to talk to him. Both Brutes talk back and forth saying that something isn't right before Dreadnaut kills them for 1170 damage each. The brutes will drop bones that are exactly the same item as those found in the overworld.
It used to be possible to safe-spot Dreadnaut with magic or ranged. Using gatestones, players could trap him behind the boxes in the room and safe-spot him. This method has been removed, as Jagex has removed all the boxes.