“Starting tomorrow, for 1 week (7/2-7/9), the new Locked Roman Holiday Crate will have a chance to drop from any Arlor boss. These crates contain one level-appropriate Legendary Roman Candle weapon for your class. There are 4 variations of each weapon and they exist for Levels 2, 5, 10, 15 and every 5 levels up to Level 75. “

Don’t know if this is a bug or not, but the crate contains more than just the Roman Candle weapons and the weapons are mythic rarity.