Rubble Golem
Eats nothingLandNot rideable
Colossus petram. Extremely Territorial
Method
Cannot be tamed
There is no way to tame this.
Taming
Rubble Golem has no taming data on the wiki, so there is nothing to calculate. That usually means it cannot be tamed at all, but it can also mean the numbers have not been published yet.