I used esperanto as elvish

Brazilian Portuguese is too "melodic" for abyssal, but some European Portuguese accents can work.

In the game I'm playing, goblins have thick New York accents. If my creepy-ass lizard person dies, I might switch to that, or a Nordic elf with a thick Swedish accent.

eh pt portuguese would work better for elvish

I thought the accent for the orc in solo leveling really enhanced the experience.

Polish for the thieves cant. Kurwa

::: spoiler All I remember from my infernal class is to ask if a number is prime....

^1?$|^(11+?)\1+$ :::

Sylvan should be Old Spanish like the faun in Pans Labyrinth

Gnomish should be more artificial. Esperanto.

I've always been a fan of that trope. I like to do a Brooklyn goblin from time to time.

Man, I should watch that again. It's been ages.