Guild Wars 2

I have a number of various cores, such as molten. How do I turn these into lodestones?

2 Cores + 1 Crystal + 1 Elonian Wine + 1 Crystalline Dust

bolded are sold by myiani a npc in white and gold robes next to the mystic forge in lions arch.

Another important note is that the cores must be of the same type.

So for instance: 2 Molten Cores + 1 Crystal + 1 Elonian Wine + 1 Crystalline Dust = 1 Molten Lodestone

Mismatching cores will not work. Finally, you can use the Mystic Forge to create them.