Orb that summons shurikens: "Ancient Weapons of Leth Verael"

Don't want to put you down or anything, but in order to get the Ancient weapons quest you need to max out your Celestial Ward faction. A LOT of grinding. ;P

As to the Xenn gear...

On Qalia head far to the NW, Dragon's Backbone area. Bunch of late 30's to early 40's quests. You need to do some of the Gnomes quests to get started on the Xenn pre-reqs.

Kill the 3d+ Xenn Fish Folk, They random drop Schematics, Energy Shards and Orbs.

Turn in a Schematic to get a quest added for the slot of gear.
There is a repeatable quest to gather 10 Energy Shards to make 1 Purple Orb
Green orbs can drop from any and all Xenn 3d's.
Red and Orange Orbs drop from the higher levelled Xenn and Nameds.

Once you have turned in a Schematic, you then need to turn in XX Green/Orange/Red orbs, and all items need 3-5 Purple orbs.

Have a farmer, who is already done with some step, use /giveplayerlootitem and pop the soulbound drops over to your char.

also, after you get max faction and you have the orb, you can then gather the items inscripted (Kel Ethla Quel, Sar Zalge Vurm) and 300 motes of power and then you can upgrade them. The dmg has been bugged since beta so don't belive the numbers you see. The positive sides to getting them, They are the longest ranged shurikens in game and they give a +50 to fire absorption buff when they are the upgraded ones. Oh ya, and you get to summon 50 every 5 or 10 mins i don't remember atm so they are free. If you are looking for dmg though, the ranged weapon vendors can sell you ones that do better dmg util it is fixed.