Boneguard said:
...For her Geas I might go for a Feat or combo of feat to illustrate that.
The point made by Mach5RR is valid. In Howard's Hyborian Age, as in the real world, there is no "proof" that the gods exist. The gods worshipped by those of the Hyborian Age are no different from the gods worshipped by the Romans, Ancient Greeks, or any of the other gods of the real world. A man believes through his faith alone.
That view causes problems with a standard fantasy world, where the gods are obviously real, and the sometime cross-over into the Hyborian Age by writers other than Howard. Sonja's "goddess" is a crossover that Howard would have never written.
But...
Demons and other ilk do exist, manifest themselves, and have visible, proven effects on the world. So Sonja's "goddess" has to be changed. Like some demons, maybe she is worshipped as a goddess but, in reality, is an angel, devil, or some other like entity in order to cast the "spell" that she does on Sonja making her the "greatest swordswoman".
In my game, I sometimes play around with this sort of thing. For example, a Cimmerian hunting party runs into a Vanir warband at the base of the Eiglophians. Two of the five Cimmerians are killed in the encounter. The Cimmerians are outnumbered three to one.
The Cimmerians are firece, spitting in the faces of their murderers. But, a cooler head prevails, convincing the other three that there is honor in retreating into the Eiglophians, where the three of them can turn their mountai skills into an advantage against the horde of Vanir.
An ambush is set up. The Vanir lose some men, but not enough. Again, the Cimmerians are pushed to a higher altitude.
This is where one of the Cimmerians speaks of how close they are to Crom's sight. What they do know will echo into eternity. No one will know how they died--but Crom will. He'll see the three of them take on the rest of the Vanir horde (who are no slouches in the mountains, either).
The Cimmerians don't pray, though. It's not their way. Crom does not answer prayers. They will let their actions speak for them.
As the Cimmerians set up their last stand, the weather changes abruptly. Lightning strikes, loudly, causing an avalanche, that wipes out most of the Vanir. The Cimmerians swoop down to take care of the survivors.
I let my players wonder. Was that an act of god? Did Crom cause that avalanche? Or was it just luck, as all know how fast the weather can change in these mountains.
It depends on the character's faith. For those that believe, it was Crom rewarding the bravery and actions of his chosen people in the face of certain death.
It's not magic. The players can, in no way, count on something like this occuring.
It's like true life. One man's miracle is another's example of pure luck.
That's the way I use the gods in my game, anyway.