This attack has gone through several revisions since the original concept posted here in the ma forums. I don't know how often the devs browse the professional forums, so I figured I'd post the final version here:
Attack of the Three Fates
"The Fates did not abruptly interfere in human affairs but availed themselves of intermediate causes, and determined the lot of mortals not absolutely, but only conditionally; even man himself, in his freedom was allowed to exercise a certain influence upon them. As man's fate terminated at his death, the goddesses of fate become the goddesses of death, Moirai Thanatoio."
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Clotho (spins the thread of life from the cosmic forces; sings of the present): given Clotho's nature as the 'spinner of life', a sizable short duration heal delta buff would be appropriate, plus a chance for 1-2 sec stun (perhaps somewhere in realm of 25-50% chance - has to be low enough to justify the short recharge).
locks MA; relatively short recharge, so as not to conflict with FoL
icon: spindle
Lachesis (measures the thread with her rod, assigning each man his destiny; sings of the past): an attack damaging the target while also returning hp to the ma, where the amount of hp returned (and possibly the dmg to target) is directly proportional to the ma's last fist attack. This attack reflects the personality of Lachesis by alloting the MA a measure of life (i.e. the heal) with consideration for the past (i.e. the most recent fist attack).
locks parry; moderate recharge
icon: measuring rod
Atropos (inevitably cuts the thread of life with her abhorrèd shears; sings of the future): a finisher attack damaging both the target and the ma by an amount directly proportional to the HP gained by Lachesis. This attack could potentially damage the ma more than the target, but both should feel as though fate has caught up to them. In keeping with the definition of Atropos, which literally means, 'cannot be turned' or 'inevitible', this final attack in the chain should be very difficult, if not impossible, to resist.
locks riposte; moderate-long recharge
icon: shears
These attacks should be MA only, and are intended to occur as a chain in the order listed (just as Fate is spun, measured, and cut), so followup attacks must occur within a certain amount of time, or the chain is lost.
I would really enjoy seeing a quest developed that would allow you to meet each of the three Fates, in conjunction with passing a test/trial of some sort, in order to acquire their respective attacks...perhaps something similar to the book quests for the ToTW/IS attacks.
These attacks could theoretically come in various ql's, but this is by no means necessary, nor aesthetically pleasing imo, since the strength of each attack, with the exception of the heal delta buff, is already determined entirely by the strength of the MA's most recent fist attack. (actually, even the heal delta buff could be adjusted according to the fist attack if desired)
Some possible ql modification ideas are described within the original concept, but the more I think about it, the more I dislike the multi-ql idea.
Three Fates Wiki & Moirai link for those interested.