Seraph Key Codes can be considered the primary seasonal currency in Destiny 2 Season of the Seraph. They are equivalent to the Vestiges from Season 17 or the Treasure Coordinates from Season 18. However, the Seraph Key Codes in Season 19 are required to open up chests at the end of seasonal activities, called Heist Battlegrounds.
Similar to previous entries, players can earn this currency from almost every activity present in the game. The trick here is to find the most optimal method for fast and quick grinding. The Guardian's inventory can hold a total of 2000 codes at a time, which is four Destiny 2 Seraph chests in total.
Disclaimer: This article is subjective and relies solely on the writer's opinion.
Public events have by far been the best option to earn Seraph Key Codes in Season 19, especially in locations such as EDZ or Savathun's Throne World. All of these locations are pretty busy in terms of events, as you will get a public event across very short intervals.
In EDZ, public events are one of the most common occurrences in the game, giving players enough chance to run a Heroic version near any one of the waypoints. Each Heroic completion drops a total of 240 Seraph Key Codes, as you will need to complete Heroic events nine times to reach the maximum count.
However, in between events, you can also choose to head inside the Lost Sectors located in Trostland. Here, you will only need to defeat the final boss and unlock the chest to get 30 Seraph Key Codes as drops.
Seeing how EDZ is optimal for public events and Savathun's Throne World is for Lost Sectors, you can choose either one of the two mentioned options.
The Investigation mission grants approximately 600 Seraph Key Codes per completion, which can be done
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