Answer: macabre and suspenseful.
Step-by-step explanation: this excerpt has a macabre and suspenseful tone because it describes the horrible death of the Prince Prospero and of all the revellers, who died in agony ("...and died each in the despairing posture of his fall"), also, it is suspenseful because even though the murderer is called "the Red Death" we don't know what or who exactly is killing the revellers.