Some major changes were made in the last patch on CN. There might be bugs when China is selected. Other servers will not experience issues. My apologies for the inconvenience.
Dealing a Critical Hit from behind inflicts Breach, dealing 50% Physical DMG per second for 3s. Duration resets every time it is triggered. Physical DMG increases by 20% when attacking a Breached enemy.
Shock Echo
When taking damage, releases a shockwave that deals damage equal to 50% of own ATK, pushing enemies away and reducing enemies' Movement Speed by 35% for 5s, CD for 8s.