Which creature does Virgil warn Dante to avoid looking at directly?

Answer: medusa

Explanation: Hi, Medusa is one of many classical mythological figures Dante places in Hell in The Inferno.

Medusa into a hideous monster who turned all who looked at her to stone

When Dante and Virgil encounter her, Virgil turns Dante around covering his eyes. Suddenly, a blast is heard, and an angel from Heaven appears driving the demons away and allowing Dante and Virgil to enter into the city of Dis.

Avoid looking at Medusa