The King Dreamer, also known as "Dream King," is a donator+ only boss. Dream king can be accessed by typing ::Dreamking.
The King Dreamer is one of the highest tier of bosses in Dreamscape due to its prayer drain ability. Known specifically for its Dream wing Boots and Assault Rifle drops.
The Soul split prayer, along with a fast hitting weapon, is required to effectively kill the King Dreamer. Other recommendations include White Glass Wings in order to have a high prayer bonus allowing you to upkeep your prayer points due to the King Dreamer draining your prayer points. Multiple Super Restore potions are needed in order to sustain your soul split usage while killing the boss.