25% chance to gain a Challenger Charge when you Hit a Rare or Unique Enemy while in Blood Stance
Gain a Challenger Charge when you Kill an Enemy while in Sand Stance
2% more Attack and Movement Speed per Challenger Charge 
Arena Challenger is a notable Ascendancy passive skill for the Gladiator that interacts with Blood and Sand Stance. While in Sand Stance, you gain a Challenger Charge on kill. While in Blood Stance, you have a chance to gain a Challenger Charge when hit a Rare or Unique enemy. Each Challenger Charge grants more attack speed and movement speed, stacking up to 10 times.