Which literary device is used when describing Vasavadatta as “clouded with a pale blue mantle, drunk with the wine of her youth”?

The literary device used in the description of Vasavadatta as “clouded with a pale blue mantle, drunk with the wine of her youth” is metaphor.

Step 1: Identify the phrases that seem to be more than just literal descriptions. In this case, "clouded with a pale blue mantle" and "drunk with the wine of her youth" are not literal descriptions.

Step 2: Determine what these phrases are trying to convey. "Clouded with a pale blue mantle" could be a metaphor for her being surrounded by sadness or melancholy, while "drunk with the wine of her youth" could be a metaphor for her being intoxicated or overwhelmed by her youthfulness.

Step 3: Identify the literary device. These phrases are not literal, but instead use one thing to represent another, which is characteristic of metaphors. Therefore, the literary device used is metaphor.