I would say make it cold iron and give it wordwalker and refinement, like you said earlier, but remeber that most gms would say thats too overpowering(well at least mine would) so give it a curse, or make it like my sword where it has a hunger of some type, and if you use its power a lot, it drains, exactly like a vamps hunger, except, if you lose all the hunger boxes, you lose say 2 mental or social. At least thats what i would do
No offense dude, but either you play with really mean GMs or I play with really nice GMs.
I and my friends do not believe this would be overpowering because
1) It can't concealed (It's a BIG sword, probably a Flamberge),
2) I am paying for it in lieu of stunts or other powers, so it's not like it's free on terms of refresh
3) It's an
Item of Power so it can be taken away/not available to my character for a scene (Which would give me a Fate point) and knowing my Friends it will probably happen
every session...because
4) This item is costing not just an Item of Power refresh, but also 1 if not 2 Aspects to justify it (
Sir Alighieri's Sword and/or
Jabberwock's Bane) This is a core part of this character in lieu of other things. The sword will also be probably be like the Swords of the Cross in that everyone wants a piece of it.
The assessment of what I had in mind is pretty accurate.
Basically I was thinking an
Item of Power with [-1] of basically refinement for 4 enchanted item slots of enhanced Warden's sword and then maybe
Worldwalker[-2] like was previously suggested.
Later in the campaign, I might also advance the Sir Alighieri's Sword Aspect to Sir Alighieri's Regalia to take other fun powers in lieu of better spellcasting. But, I'll cross that bridge when I come to it.
But at the end of the day, the purpose of having the Vorpal is that I am interesting in being one of those Warden Pups which Harry describes as still not being old enough to drink and having a Warden's Sword which is currently impossible. AN Item of Power gets me around that and crafting a story around the Jabberwocky makes for a fun back story.