I think this is mainly in reference to the various "evolved" lieutenants Raziel had to defeat.
But I also don't think a change in size is appropriate for this specific template.
If anything, the "godlike" forms of the lieutenants would be better reflected by adding one or more templates on top of the Nosgothic template, rather than trying to incorporate traits from all the unique lieutenants.
After all, Kain always remained the most powerful Nosgothic vampire, and he always retained a human-sized and humanoid form.
Kain should probably be treated as both the prototypical and "ultimate" form of the Nosgothic vampire, since all of his lieutenants ended up developing into unique deviations from Kain, starting with Raziel and his wings.