8 hours, new passive is up.
Challenge has been split into two different debuffs: Challenge and Exposed. Challenged enemies can be struck by Xin with auto attacks or E up to two times for 1 second of CDR applied to all on CD abilities. Once these two hits have been obtained, Challenge is converted into the debuff Exposed which is a Xin's old passive of 15% reduced armor, but this version stays with the target even if Xin switches targets. Both Challenge and Exposed have increased durations given their conditional nature. Hitting a Challenged enemy will reset the duration of Challenge, hitting an Exposed enemy will not. This information is tracked in an indicator in the shape of Xin's spear head. When an enemy is challenged, a silhouette of the spear head appears, the first hit fills in the outer prongs, the second hit removes the outer prongs and fills in the center gemmed prong which represents the Exposed debuff. If challenged again, the center prong remains lit and outer prongs reappear. First hit then highlights the left prong only, then removes both prongs on the second hit so only the jewel prong is visible. If Exposed expires during a Challenge, the interface corrects itself.
Debuffs carry their caster as data. AoE checkers no longer double register units inside their bounds. Spells do not stack their unique debuffs, they refresh them instead. All spells are now equipped with a toggle for being able to Challenge units.