about 3 years ago - Ahskance - Direct link

The King of the Seas containers that container those pieces are given out during the event~ By having your account linked to Twitch and watching any of the Streamers that volunteer to cast the matches of the Tournament.

Typically you can only earn 1 Container per day or weekend, so it really takes 2 or 3 KotS events to finalize the collection.

King of the Seas will return for Season 14 some time in the future~