Given that I was thinking about an AS&SH witch yesterday and in light of their sale that it might be a good idea to give Skylla a try. Also I would like to compare this Skylla to the Dragon Magazine and Eldritch Witchery versions since I think thematically they will be the closest.
In many ways the Witch from AS&SH really captures the concept I have of Skyll very, very well. Not just in terms of being a witch, but as something half forgotten out of a misty past. AS&SH Skylla might be the most dangerous one yet.
Skylla in Astonishing Swordsmen & Sorcerers of Hyperborea
As with the other write-ups I am going with 7th level. I will try to find similar spells, but when the option arises to take a "witchier" spell, I'll take that.
If I had to name a Tradition for her it might be something like a Cthonic or even a Hyperborean one.
Abilities with an asterisk are her prime abilities. In this case, Intelligence and Charisma.
Race: Common (but could be Atlantean or Hyperborean)
Secondary Skill: Scribe
Casting Ability: 7
Fighting Ability: 3
Hit Points: 20
Alignment: Chaotic Evil
AC: 4 (Ring of Protection +1)
1st level: Brew Potions (x3), Read Magic, Scribe Scroll, Familiar (small demon - raven)
3rd level: Brew Love Philtre
5th level: Dance of Beguilement, Effigy
7th level: Animate Broom
First: Charm Person, Detect Magic, Light, Sleep, Shocking Grasp
Second: Detect Invisibility, Levitate, Locate Object, Ray of Enfeeblement
Third: Phantasm, Witch Fire
Fourth: Shock Wave
Ring of Protection +1, Dagger +1, Broom
More powers and a wider variety of spells. Plus in these rules she gains bonus 1st and 2nd level spells due to her high intelligence. The powers are most similar to the Dragon #20 witch which is no surprise; we are all pulling from the same sources. I honestly was not expecting huge differences here.
Looking over the spells and some of the magic items I can see how you can get a whole lot of play out of just 12 levels in this game.
Other Skylla writeups