A world boss on the Dreadnaught would be amazing. Could be a whole patrol map security defence thing. Everywhere unless you are in special area and not the patrol map. More aggressive enemies and ship defences hit everywhere. You get an icon if where the central command is and know it needs to go down or this event will prevent them from exploring safely. Central command is a dark spirit fire if a golem controlling the ships systems. Hive, various Taken enforce the area. Possible rewards are based on a buff you gain based on how much damage you do to the boss and mobs. Powers a key that unlocks a stasis chest where the Boss dies. Imagine that everyone rushes in. Hopefull what they have done in effort will grant great rewards.