In-universe, there are debates over whether the source of his strength meant sexual abstinence or vegetarianism.
Fan speculation is that Ettric's body had been augmented with Ettin robot parts. As far as we know this theory has not be considered by Sylvester.
Appearances in the comic Edit
He has been mentioned only once so far, here. He is shown as a silhouette.
The First Earl (unknown succession)
|Earl of E|
Ettric II (unknown succession)