Sovereign Ooze Lord

When sovereign ooze vassals are near each other, they are compelled to join together. The process of merging two Sovereign Ooze Vassals takes one hour, resulting in a single Sovereign Ooze Lord.
The resulting sovereign ooze lord has a more evolved intelligence than its component creatures. They can think and plan, as well as communicate telepathically with other creatures on a more complex level. They can make bargains and—more importantly—break them if it furthers their goals.
In addition to the urge for self-preservation, the sovereign ooze lord has the drive to find others like itself, commanding its ooze vassals to seek them out. Ultimately, it searches for other ooze lords to merge with to form a Sovereign Ooze Monarch.
At its core, however, the sovereign ooze lord is driven to bring chaos and formlessness to everything around it.

Careless wizards, artificers, alchemists, and other creators of magical substances sometimes dispose of failed experiments haphazardly. They think city sewers or workshop basement grates are safe places to dump their magical waste. These remnants, often liquid in form and brimming with magical potential, interact with organic matter—blood, bodily waste, or dead flesh—to gain sentience and form. These newly formed creatures are sovereign oozes.
Sages who've studied the lore of these creatures believe that another factor may also contribute to a sovereign ooze's creation and its drive to transform the world into the same substance from which it is formed. These experts have proposed several possible catalysts: intervention by a great demonic power, such as Juiblex; influence from one of the planes of chaos, such as Limbo or Pandemonium; or manipulation by a god associated with chaos or entropy (perhaps with a tinge of evil), such as Ralishaz or Tharizdun.
Unlike many other oozes, sovereign oozes possess advanced sentience, and in the case of the more evolved sovereign oozes, sapience. This cognitive functionality allows the lord and monarch versions of the sovereign ooze to communicate and develop intricate plans that involve manipulating other creatures.
Sovereign oozes can assume rough shapes of other creatures they have encountered (or eaten). These forms cannot replicate fine details, but are refined enough to sometimes fool inattentive observers or those whose sight is obscured by darkness.
Sovereign oozes consume organic matter to gain energy, and they grow in power by combining with other sovereign oozes. Two Sovereign Ooze Vassals can join to become a Sovereign Ooze Lord, and two Sovereign Ooze Lords can join to become a Sovereign Ooze Monarch. Experts are unsure whether two or more monarchs can join, and they hope they never find out.