Elemental Cores

Elemental Cores which can often be confused as "Yellow Crystals" are used for evolving drones into 5 Star Drones, which boast much higher stats then their predecessors. They are also used to fuse two of the same 5 Star Drones into each other, giving one higher stats.

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How to Obtain
The most common way to obtain Elemental Cores is just from mining, as leveling up Drones takes a lot of time and mining, you will eventually begin to stockpile them if you excavate enough.
 * Excavate a Mine or Shipwreck, they will rarely drop.
 * Get them from Supply Drops.
 * Make offerings at the Offering Well.
 * Opening Crates.