Shard progression
Keep a random Expedition shard streak active
Activate the consecutive-win bonus, then collect the extra same-tier pack on each continuing random Expedition victory.
Expeditions menu, with random maps selected at a Chaos tier you can clear consistently.
Once activated, the streak pays the bonus on each later consecutive random-map victory; it ends when a core breaks or you leave the game.
Stop after you obtain the shard or shard pool result you need, or when a failed run ends the streak and rebuilding it is no longer worthwhile.
Open a guide to find other locations and see what the item is used for.
Activate the consecutive-win bonus, then collect the extra same-tier pack on each continuing random Expedition victory.