Trials of St. Lucia is the second bigger DLC for Dante's Inferno, introducing a second playable character to the game in the form of St. Lucia, a Christian martyr, serving as Dante's guardian angel. She plays differently than Dante, focusing more on speed and agility.
The focus is on the Trials this time, similar to the Gates of Hell challenges in the original, these are wave-based missions that can be played solo, or cooperatively. Some of the objectives include taking down a certain number of of enemies within a time limit, surviving waves without taking a hit, or killing all enemies except a particular one.
There's also a challenge editor included, through which players can customize (choosing settings, adjusting waves and the stats of the enemies) and share their challenges with other. The game comes included with 40 challenges, out of which 25 are solo and 15 are cooperative ones.