Artifacts from CoO, of course. I get a million ghosts every Iron Banner. Since IB is over, CoE is a good place to get 335 ghosts.
Then you'll finally be 335! And then about 80% of the exotic engrams/end-game loot will drop at 334, which means instead of getting a fitting reward for completing the game's toughest challenges, you'll earn weapon parts/armor material and glimmer (sometimes they throw in an exotic shard).
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I always check to see the stats on things that drop less then 335 just to see if they are better then what I have already. Since there is no penalty for infusion it's a no brainer to at least check. A couple of time I got an artifact and ghost with better stats then what I had but at a lower light level.
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Court hasn't granted anything so far. As for IB, I shall wait. [spoiler]thanks btw[/spoiler]
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I'm pretty sure the artifact is guaranteed in CoO. It's only from the tier 3 boss (the antiquated rune one). Once I got to 334, I used 10 runes I had and every time I got an artifact (a couple were 334 but the majority were 335). I only need three for each character so I haven't been back to test whether or not the drop is guaranteed.