Karsha continues to gasp for air even coughing now and then. The toxic mist of the snake wasn't as easy as he had anticipated. The fact that his own domain went against him means the creature was more than it appeared to be.
Karsha also noticed it's not every time he can use his domain. The toxic mist would have taken time to get that dangerous had it not been for the domain. The domain was the perfect container so even though it was huge, the toxic accumulated quickly and started to thicken which raised the toxicity to the next level.
"Cough" Karsha coughed once more before he heard the system notification. It appeared when he deactivated the domain, the creature was still alive albeit barely clinging on to its life.
Had it not been for the last 10 spears, it would have gotten back up, but Karsha was more thorough than most. When the untamed general kills you, you stay dead, forever.