Purchasing a 3,000 coin Sea Pack will randomly grant you one of five pre-set 14-card packs. Not all five packs have the same odds.
Sea Packs introduced one new, exclusive 8★, Mardoll, and reprinted one exclusive 7★, Euphemia, as well as a number of limited edition cards.
There's no limit to the number of packs you can purchase, and you can receive the same pack multiple times.
The images for Sea Packs listed 5★ Frau and 4★ Rethel as 6★s in the Shotgun Pack; this is incorrect. Players who pulled that pack recieved Beatrix and Alexander instead.
Light of the Sea Pack