You have extracted the core from the Vengeful Elemental. Perhaps it can be refined.
This quest is kind of hidden in Galeras. You have to take a hidden path up a hill and you will find a totem there that, once interacted with, summons a wind elemental. Once you kill the elemental (100k HP so bring some friends or be at least lvl 19+) it will drop a Vengeful Elemental Core, item that starts this quest. Just go back to the totem that summoned the elemental to finish the quest and get great weapons (each class gets its own version) that have imbuement bonuses to them. Each imbuement level requires you to defeat one of the bosses in the Stormtalon instance. Together with the omni rune slot these are some of the best weapons you can have at that level.
Note: There’s a nearby scientist mission that helps you unlock a “Mysterious Exo Lab”, which contains a datacube.
Return the Vengeful Elemental Core to the Thundercall Staff
Required Level: 17
Category: Item Imbuements