Elixir Field misnamed.

[xXRaineXx]

I think 'Blue Spirit Gun' is not very good as a hard translation, especially gun usually refers to "槍"(gun) but not "砲"(cannon).

With my limited knowledge, I will translate it to:
蒼 = Horizon (color likes aqua, azure, sky blue...etc)
気 = vapor (visible)
砲 = cannon (larger than gun!)

Therefore, my hard translation of "蒼気砲" would be "Horizon Vapor Cannon"!

Limited knowledge indeed.

"槍" or "yari" means "spear" or generally a long lance type weapon. "砲" or "jyuu" does not mean "cannon", it means "gun" as is, in general it refers to small arms including small rifles.

A hard translation of "蒼気砲" - "蒼" = "ao">"blue" - "気" = "ki">"spirit/essence" - "砲" = "jyuu">"gun" = "Blue Spirit Gun" is the most hard translation as you can get.

Source = I'm Japanese. I understand your effort, but you need to study more.

Edit;
Cannon is referred to as "大砲" or "taihou", the same Kanji used for gun is used here, but "-砲" or "-hou" is only a suffix, it cannot be used by itself to refer to a cannon. "大" or "tai/dai" means "large/big", which refers to heavy guns, cannons/artillery if used together with "-砲".