The Sibling is related to Stormfather and Nightwatcher/Cultivation. So it has something to do with storms and growth.
It is also associated with Urithiru. Urithiru strata are described to look like layers of dried crem. But it is located above clouds and storms.
Similar description applies to Kholinar windblades aswell, and these are certainly not natural formations.
Other unnatural formation might be Shin mountains. People were given this land to stay there, and then were separted. So they were given land without storms (Stormfather), with soil (Nightwatcher), and unnatural mountains (?).
The Sibling is cremspren
Crembrother
