I see that there is an option to upgrade familiars to Combat, Power, or Spell Familiars. The question I have is; when is this done?
Do you have the option of upgrading a familiar at some point after you acquire a familiar?
Or do you have to announce the kind of familiar, if any, before you roll? Which, if you did, would suggest that you would have to pay the upgrade cost before you roll and then find out if you get the familiar.
To me it seems overly harsh to tack on the upgrade cost to the rolls since you pay that even if you lose the rarity roll.