Arcanists and their spells

[Bombast]

Actually, it's mentioned in the blm and whm quests and lore that they are unique for using the aether of the land (hence the destruction wrought by the war of the magi.) So, by exclusion, we can see arcanists use their own aether.

Except that Summoner's also pull from the surrounding Aether to create Egi's.

Which isn't to say Arcanist do. But it displays something people frequently forget - Just because someone in the game says something, doesn't make it true. They can be mistaken, or simply full of it, as well.