Vibrations I ? Causes an object of up to 1 pound mass to vibrate rapidly; if fragile it may break (roll a RR). If it is an object held by a being the being must make a RR or fumble it (each round).
So there is no second RR to see if the wielder fumbles it - it's all base on the first RR which determines whether it vibrates in the first place?
...because I'm still feeling that the description is implying 2 RRs; The first RR to see if the sword vibrates for the duration of the spell (which would get an RR initially based on the character's level) and if the RR fails, then the sword is vibrating for the duration. Then there's a second RR which is made each round (according to the spell description) to see if the wielder fumbles the sword that round.
At this point, the sword would have already failed the initial RR to see if it started to vibrate (based on the wielder's level) and as with all spells of a set duration, this RR is rolled once, and if failed, the sword would vibrate for the entire duration of the spell.
But now that the sword
IS vibrating for the duration (and there's no further RRs to see if it carries on vibrating - just like ALL spells with set duration's), the RR that the wielder needs to make now is whether the constant vibrations of his sword would make him fumble it each round. A successful RR means he didn't fumble it that round despite the vibrations and a failed RR means he did fumble it that round because of the vibrations. Whichever the result of this second 'fumble/no fumble' RR, the sword is still vibrating for the duration if the initial RR (to see it it does start vibrating) failed.
It's the 'fumble/no fumble' RR that needs to be made every round that I think needs to be based more on the wielder's OB (or ranks in OB to act as the level) for the RR instead of his magic resistance - because his magic resistance would have already failed when the spell was cast and the spell caused the sword to vibrate for the duration. With the sword vibrating, it's no-longer a magic resistance the wielder needs to make as a pass wouldn't mean the vibrating stopped - it just means that the wielder managed to successfully master the grip of his sword and managed not to fumble it.
In order to successfully master his grip on his sword (if it were constantly vibrating), I don't think it should be based on his resistance to Magic because we're not dealing with magic anymore, this is a physical effect now (just like a magically created 'wall' spell actually creates a physical 'wall'; a character passing an RR doesn't mean they can walk through the wall because they have a good resistance to magic. No amount of RRs is going to dispel that wall - it is now a physical surface); I think the second RR should be based on one (or more) of the following - his skill in the weapon as a bonus to the RR, using the amount of ranks in his weapon to use as the 'target's' level or using his Agility stat as a bonus to the RR as this is what would determine whether someone keeps ahold of something if it was constantly vibrating.
(I'm starting the favour the skill ranks in the sword as the target's level (as is used in disarming weapon attempts) or using the average of the Character's level and his ranks in the weapon as the target's level and using the Ag bonus as the bonus to the RR ...and I may make it a house rule after I try it out today).
I know I would be upset if I was a character who was a master of my weapon and had an amazing Ag bonus but had a bad resistance to Essence which meant that I wasn't not able to hold onto my vibrating sword.
Causing the sword to vibrate in the first place based on the character's level and resistance to Essence is not a problem for me - it's the ability to keep ahold of the weapon once this physical effect of vibrating is manifested on the sword that I don't think should have anything to do with a character's resistance to Essence.
I may just be making it overly complicated.
...unless there's an '
official' ruling on the subject where it
IS the character's magical resistance that's determining whether it's fumbled each round?
(get ready to use the red colour because I am listening)