An ancient krogan sport, now seeing a revival.
(Art by Armax_Hammer)
Participants ride on kakliosaurs and make a show of knocking another rider off of their mount, similar to human jousting. The only rule is that the opponent has to be knocked off in order to claim a victory. Deaths don't count, and any weapon (except guns) is permitted. Some riders have trained their kakliosaur to assist them.
With the revival of kakliosaurs in the Reaper War, the sport has been revived on Tuchanka. It's been krogan-only so far, unlike (for example) the Mannok-Vahk Tournament which allows aliens to enter. This is because it's so violent, and because taming a kakliosaur takes time and skill.