The Linux-version of Sword Coast Legends can suffer from graphical and other bugs, like

• the game is too bright, especially in story mode
• the "conversations" of characters show no animations, instead there is a blank screen
• the weapons of characters will be drawn oversize and then "break" the screen
• some creatures would spawn out of the maps
• you'll be not able to load any game, instead you get an error saying "save data invalid"

All this can be fixed with a simple entry in the launch-options for this game in the steam-client:

LC_ALL=C %command%

The cause seems to be the underlying Unity-Engine.

Beware: this will only work for fresh started games and characters!

Source: Steam Forum