I've got a hold on a very nice species and revised them a little...

So meet the very first Ontium.
☺ They are magic golems created by wizards.
☺ If they belong to someone they can have a collar or markigs on their body.
☺ They are hollow inside. If you put something (for example, a piece of gold or a plant) inside, the Ontium starts to search for this substance/item. They smell with their tongue like snakes, they have a great hearing, they are very strong and enduring. So they travel searching for whatever they were ordered to collect. When they find it they "eat" it and store in their empty belly. The belly is made of semi-transparent glass-like material so you may tell if the Ontium is full up or empty. When they are full, they return to their owner.
☺ If an Ontium gets free they will search and collect the first thing they ate.
☺ They can be used for harvesting, mining, hunting or finding a person if you have any of their possessions.
☺ They may be intellectual and sef-aware or just mindless beasts depending on the skill of their creator. But usually they are not very smart and educated, still they can talk a bit and understand some words and commands and overall have mind of a little child maybe. Some of them are capable in futher developement and even education and others would always stay no smarter than a dog.