2018 SF, second of a trilogy. Thorn comes back to civilisation to end
slavery, and the long-running war.
And he does. It's always obvious what to do next, Thorn and his
allies never face a problem that's more than trivial, and no enemy
ever works out what they're up against before it's too late to do
anything about it. This whole book is the final victory chapter, and
my goodness it gets dull.
(If you need a justification for the GURPS Unusual Background
advantage, this is it: not only is Thorn the most powerful mage ever,
nobody else in this setting has even heard of magic as more than
a fable, so they have no idea what might work to counter it.)
Someone suggests that Thorn might effectively have become a god, given
that he can do anything he wants whenever he wants to, but he reckons
he hasn't, so that's all right.
Thorn does grow up a bit this time, which is something, but this book
really didn't have much to say. Fortunately it didn't take long to say
it.