League mechanics: Expedition. You’ll meet a group of Kalguuran traders and assist them with recovering their ancestors’ runed artifacts.
At marked Expedition sites, you must strategically place a series of explosives and detonate them. These explosions unearth a horde of undead Kalguur that must be slain in order to gather the equipment and artifacts buried among them. These artifacts may be turned into one of the Kalguuran traders who each offer a different style of trade themed around bartering, gambling, dealing and exchanging.
One of the four NPCs from the Kalguuran expedition will spawn in the area, surrounded by various markers. Approaching them will allow you to start placing explosives to excavate the area. Any marker within the explosives range will unearth monsters or chests. The explosives detonate in the order you’ve placed them, and there is a maximum range between explosives. There are also Remnants which add mods to monsters and chests spawned from the explosion and all subsequent explosions.
Any artifacts you find from the expedition will match the NPC that spawned. NPCs do not refresh their stock unless it is manually restocked, using specific currency items to do so.