Silver Tongue at 100 gildar is a bummer... and in the early to mid game virtually useless because of the high cost.  Especially as it is only usable once a combat at present.  Could it be 50 gold for first use, 100 gold in 5 turns?  That would give it a bit more utility.  And it would be nice to be able to use the ability on wildling shamans or similar presumably intelligent creatures. 

And another thought:  Could half-ogre be a starting sov trait?  Give that player the ability to recruit ogres, trolls, garrotes and escaped juggernauts?

And another, another thought:  Dragon-kin:  You can charm skaths, slags, pack drakes and at 15th level Dragons.

Or a charming orb could be a powerful artifact we could quest for...