I am trying to write the story for an RPG I will make in the future. The world itself is huge with multiple continents and landmasses, but the current story takes place on the main four continents. While the third continent is an empire, the other continents have a huge, diverse amount of kingdoms/nations and languages. The story involves the main character, a destined "chosen one", having to go all over the main continents to try and make diplomatic alliances.
One problem with the worldbuilding I have is the immense number of different languages. While there is already a solution for the protagonist (his enchanted helmet "translates" the major languages,) deuteragonists and tritagonists unfortunately do not have that luxury. While a few are at least bilingual, the rest only know one language.
What is some advice for trying to have character communicate with different languages and barriers, but without too much filler of having to constantly learn a new language?