d8Language
1Dwarven
2Elvish
3Gnomish
4Hin
5Uncommon language
6Uncommon language
7Uncommon language
8Rare Language
d6Rare Language
1Abyssal
2Aklo
3Celestial
4Infernal
5Undercommon
6Reroll

When you finish a long rest, roll a d8. The number it rolls determines a language that you are proficient with Linguistics with until you finish a long rest, as shown below.

If you roll a 5, 6, or 7, roll another d8 to determine which rare language you are proficient with.

If you roll an 8, roll a d6 to determine which rare language you are proficient with.