Renegade is a Void affinity rare from the Knight Revenant faction. Renegade is best known for end game speed farming with an ability on her A3 which reduces the cooldown of all of your teams skills by 2 turns. When paired with big hitters such as Royal Guard or Coldheart she can reduce the cooldown of their Max Enemy HP abilities and allow them to nuke again faster!
This leads to her best place in Raid being Dungeons. She can speed up times in Spider, Dragon and Ice Golem and Fire Knight significantly but it takes the right team set up.
Generally Renegade will need to be the slowest on your team to get the resets after the main abilities have been used.