The question says it all. Where do Molten Lodestones drop? I need 6 of them to make runes but I can't find them anywhere.
According to the GW2 Wiki, there is a Mystic Forge recipe to promote cores to lodestones: http://wiki.guildwars2.com/wiki/Mystic_forge#Lodestones
The example uses Charged Cores, but any cores should work.