"Yes. The last craft of Nidavellir." The way he speaks of it is final, an ending, rather than just the dwarves' most recent work. Thor has already spoken of Ragnarok and the fall of Asgard, but Loki will easily be able to infer that some catastrophe has also befallen Nidavellir, as well. Perhaps it's even to be expected, with the realm of the Allfather in ashes. All of Yggdrasil is connected, and Asgard had been no exception.

Thor's free hand wanders up to his eyepatch, absently tracing the scar on his cheekbone. "That was Hela's doing too. Turns out Mjolnir used to be hers, before Father gave it to me. She had a... way with weapons. Creation, destruction. She unmade it before my eyes."