Witchfire Trilogy Spoilers and adaptations
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Sorry, but s' true.
These are a difficult set of adventures to adapt. I do not think they could be run in the Forgotten Realms at all, and they'd be difficult to do even in Greyhawk.
In brief, the trilogy story is this.
Twenty years ago, a coven of sorceresses were betrayed by the corrupt magistrate of the city of Corvis and executed by a wizard seeking to gain power.
Ten years ago, the corrupt and evil king was defeated in a civil war by his brother and fled into the marshes.
In the first adventure, Alexia, the daughter of one of the executed witches attempts to gain justice (or revenge) by sending an army of the undead into Corvis destroy it and gain a sword called Witchfire, which is rumored to have necromantic powers.
In the second adventure, Alexia raids a mysterious temple of the machine god Cyriss to resurrect her mother. The party pursues her, (hopefully stops her), and then returns to find the evil king has reinvaded the city with inhuman allies.
In the third adventure, the party finds themselves leading a resistance movement against the evil king, eventually raising an army of the undead themselves and performing special-operations tasks in their support. The adventure features a combat with an armored gunbearing monster: think Godzilla with a howdah and a dozen 24-pounders.
It ends with Alexia attempting to shatter the Witchfire: this will unfortunately release the necromantic power of the sword and make the city of Corvis into a place entirely populated by the undead.
Presumably the party stops her, if not, they'll need to be rolling up new characters.
There are three major problems that have to be addressed here for any conversion.
1. Magic. It is difficult to imagine anyplace in the Forgotten Realms where sorcerors would be automatically assumed to be evil and executed without major resistance and repercussions from the various gods of magic. If this does not happen, Alexia loses her motivation to do those things she does. You could make the coven really evil and Alexia deluded as to her mother's true nature, however.
Also, in the Iron Kingdoms, Resurrection spells are not available: that's why Alexia has to storm a temple to try and bring her mother back to life. Resurrections are generally more available in Grayhawk and the Realms. You could handwave this with some limited wishes to bind the coven's souls or something, requiring a little more oomph in the resurrection than is commonly available.
2. Technology. Not so difficult to do. There are some special operations missions where the party is supposed to assault emplaced cannon, but they could be changed to catapults with minimal trouble. It is also strongly suggested that the party have a steam jack to overcome one obstacle, but it's basically just bashing down a big stone door. Adding a little more magic back in makes that much easier to deal with.
3. Campaign altering things and events.
You'll need a large city with corrupt leadership.
You'll need an exiled evil king: and not a long forgotten one, either. People should remember him in a not-fond way.
You'll need to be able to handle a major invasion force capable of taking on the country the city is in: what are they, where did they come from, and what will happen when they get invaded back?
You also need to recognize that the end of the Trilogy can permanently alter your game as written: that might spark new adventures, which is good, but you might prefer to change it.
