A pair of these dropped during a LS salvage run in Bhaf. Rem. about an hour ago. We were a small group, and had a rough start, but finally got going. Made it up to and into the porter on 2nd floor, which was when the 1 min warning went off. The Njord's Trousers dropped roughly halfway through the 2nd floor. While I can't visually confirm it, a member of group said it dropped from one of the Scorpion type mobs. We had our only real linking of mobs around the time of the drop, so had 4-5 scorps running around after me while alliance dealt with one. I can't say for sure which scorp it dropped from, but they were a pretty common mob on the 2nd floor. I'm assuming the items drop totally randomly like relic in dynamis. There are three to four room with at least 4 scorps each and trolls with them. If I can later, I'll try and look on the maps to see if I can remember exactly where it was. Anyway, the only people in the group with BST/THF/RNG/COR were myself and another RNG, and I was lucky enough to win lot. The stats listed here are correct. The model looks just like dusk trousers, but dark gray instead of purple, and silver colored kneepads.
If anyone else has made any progress on upgrading these I'd love to hear the process and what other ingred are needed.