Radram

Radram (Radon Ramius) is an alpine Ele-animal hailing from the mountainous peaks in the Kingdom of Knowledge.

Origin
Radram was originally thought to be an extinct or mythical  species until progressive scientists noticed radioactivity around various granite deposits in the mountains. Wearing full hazmat suits and gear, they scoured the area until they discovered that Radram was not only invisible, but also had the unique ability to sublimate into a gas and become relatively intangible (as well as go through deposition and change into a solid once again).

Using advanced KoK technology, the scientists were able to capture a glimpse of Radram's form, but the process was tedious and sightings have been rare since.