Oxium

Oxium is a very interesting, blue mineral.

Holding it in possession allows the person in question to act in thinner atmospheres as if under Earthconditions. Oxium is found on the Mars of the late 19th century, and allows physical acticivity, unhampered by the thinner martian atmosphere.

However, despite its uses, Oxium is in constant danger of being devoured by the disgusting Oxi-Leeches, for whom Oxium is their favourite food. Even keeping it in a backpack won't save the Oxium from being devoured.