On Maestrea, we have our fair share of custom items. Some of those custom items are crafted. You can find the recipes using /ccraft. Here are the items you will see listed in the crafting GUI:

Smelting ores in the glimmering furnace can yield Crystals! (The crystal will be dispersed on top of the furnace if one procs to drop, top advice would be to have a max level hopper nearby to pickup said crystals)

Smelting ores in the glimmering furnace can yield Crystals! (The crystal will be dispersed on top of the furnace if one procs to drop, top advice would be to have a max level hopper nearby to pickup said crystals)

Right click to launch yourself in that direction once attached.