[Sorenant]

Originally Posted by PK

I would recommend against using one magic system as the basis for the abilities of another. That way lies recursive madness.

I suspected so much (it would kill the point of remaking spells as advantages) but this particular spell had so many variables I took the shot.

Originally Posted by PK

Instead, Blade of Grass really does work best if you approach it as creating a sword from (almost) nothing:

...snip...

That's great! Although somewhat obvious in hindsight, I would never have thought about using a combination of Create and Control to achieve the flexibility needed to model this spell as advantage, much less about the One Task Wonder perk.
Actually, this spell contruction seems to flexible it makes me wonder about the possible variants, like this one:

Stick of Wood (or something cleverer)

Keywords: None.
Full Cost: 9 points.
Casting Roll: IQ.
Range: Touch.
Duration: Indefinite.

Statistics: Control Wood 1 (Accessibility, Only for forming the one type of stick that fits the branch, -50%; Magical, -10%) [8] + One-Task Wonder (Armoury (Melee Weapons) for stick-making) [1]. Note: Uses sorcery's Indefinite duration instead of lasting for 10 seconds.

Create Steel wasn't necessary so I cut it out but the cost stayed around the same because Create category moved up to Common. I didn't change the accessibility cost reduction because although this spell is more easily accessible (decent sized branches are not hard to find and you can break it to get smaller ones), the resulting product is not as marvelous as the original spell (sticks are useful but not like a free otherwise expensive sword with a nice cutting edges). Not sure if strictly legal but probably not so bad considering this spell in effect just eliminates improvised weapon penalty...
By sticks I'm thinking, from shortest to longest: Short Baton, Baton, Jo, Quarterstaff and Long Staff. Maybe Tonfa if it's a Y-shaped branch.

Originally Posted by PK

I think nailed Tree Bark Armor. My take on it was that it assumed you were unarmored, not that it would add additional armor to your existing armor. However, it isn't really clear in that respect, and I take responsibility for that as co-editor. I'll look into it.

Good to know I had at least something going on for me.
Now that you mentioned it, I think the fact I ask a fairly "boring" question yet not much later the author and co-editor of the two works I'm basing off gives me an elaborate answer like this is awesome.
By the way is there some bibliography of each GURPS writer? RPGnet has one for individual books but not for Pyramid articles. I could of course check the warehouse page of each one and see the content but doing so for so 100+ volumes is a little daunting.