FvS feat change?

[Ryan220]

I recently got my LoB WF Soul to 20.

The capstone freeby of casting some type of Shield spell doesnt seem too exciting (or am I missing something obvious?) so I thought I might switch to the Sovereign Host so I can have the freebie heal instead.


However, Fred doesnt seem to offer me the option of changing from LoB to Sov Host.


Is it an LR only option?


Any help appreciated