If I am not mistaken, any fate has the chance of dropping one of these. Just pick an area where fates pop frequently and where lots of peope often farm and go to town. On my server, Coerthas would be that place.
2 Weeks of farming fates straight for Light on the Novus weapon I only got 10 Alexandrite. I recommend doing the maps, and dumping the 400 Soldiery on it whenever you get a chance. Also, if there is a hunt group, join those you can get 200 Allied Seals pretty quick in a hunt group.
Hunts are the most efficient way. 10 A ranks = 1 piece. It took me about a week and half of Hunting to complete weapon (using Sold and Exp Roulette quest also). Never had a piece from FATEs. Which zone did you use for that? Have considered that approach myself but it's only 1 light per FATE, isn't it? I know we can totally AFK it but still, its a lot of hours required.
