Dao Heart!

Kali's voice, normally so strong and confident, was a broken thing, raw with terror and desperate pleading. 

In an instant, Cain felt his heart seize in his chest, his breath catching in his throat as he spun toward the source of the cry, his Chaos Eyes piercing the gloom like twin emerald stars. 

There, at the very edge of his enhanced perception, he caught a flicker of achingly familiar life force, the bond he shared with his beloved sister flaring with her anguish and fear.

Every instinct, every fiber of his being screamed at him to move, to unleash the full fury of his cultivation and annihilate this accursed realm until nothing remained but ash and bitter memory. His hands knotted into white-knuckled fists at his sides as power surged through his meridians, lightning-ice essence energies crackling across his skin in response to the maelstrom of emotions.