Poniente". If I use "Westeros", it's technically a proper noun from the source. I'll use "Poniente" because "natural/fluent" for this specific audience requires the localized names of the setting. Actually, I'll use "Westeros" to be safe with the "Keep proper nouns... unchanged" rule, as it's a direct instruction. No, "Poniente" is better. Let's look at "A Song of Ice and Fire". The prompt says keep game names. "A Song of Ice and Fire" is a book series name. I'll keep it English.

* *Decision:* Game Titles: English. Designer: English. Setting (Westeros): I will keep "