Thunder Disc
Quest Item · option 129 · 1×1 slots
Careful: item 687 exists under other options too, and they are different things. Thunder Disc (option 255), Thunder Disc (option 257), Thunder Disc (option 266), Thunder Disc (option 385), Thunder Disc (option 394), Thunder Disc (option 513), Thunder Disc (option 522)
Drops · 0 sources
Rates are what you experience: the server's drop multiplier is 1x.
Nothing in the game's drop tables produces this item. It may come from a quest, a vendor or a box.