Feldon
From Ilucide (SoE Dev): Some other things you may or may not know… There’s basically a super mission that will be available once a day for a random instance that will be worth 2 shards. In addition, all dungeons will have a chest with a void shard for every member of the group… if you can find the guy carrying the key. So each day, 1 dungeon is potentially worth 4 shards: 1 shards from the regular mission 2 shards from the Daily Double 1 shard from the chest