[@Golem][@Natsucooldude] I was thinking mostly in the area of trade and namely that of Mythst, something unique to Mrystrost (my place yo)

[hider=Bit on Mythst]
Mystrost's main exports are that of a magical nature, of note is Mythst. Mythst is a strange, mysterious element, only appearing in the Forgotten Kingdom as a result of the Thousand Year Mist which it had isolated the nation. It takes on a state between liquid and gas in an almost plasma-like nature although it can be hardened into a solid form. Colored like a moonlit silver, Mythst's magical properties are great, able to enhance the effects of any other type of magic as well as reinforce physical materials. When "retuned", Mythst's properties change so slightly to create Salus, a pale blue liquid not unlike the blood which flows through the veins of Hallows. 

Salus is a form of healing and the Art of Retuning which refines Salus from Mythst is considered the highest form of Alchemy normally used to create healing solves and such. However, the process making pure Salus is long and difficult, leading people to create slightly cheaper Salus Flasks; flasks with some bit of Salus mixed into the glass of the flask which provides a diluted healing effect of that of Salus. These flasks themselves are incredibly durable as the Salus which they are bolstered by still retains the reinforcing properties of Mythst. Such Salus Flasks are common amongst adventures and explorers to venture deep into Myrstrost's unknown past.
[/hider]

As for the defensive alliance, I'm more than happy to entertain that while respecting traditions which may prohibit outsiders from directly stepping foot on your lands if you so wish ^^