Jia Sidao lulling Ling Ling with a story of a noble girl with bound feet... just to get her to say that, yes, she'd like to be a noble like that. That's all the consent he needs to feel all right with grabbing Ling Ling's feet and starting to break bones.
Kublai preparing for the siege on Xiangyang by butchering his Chinese prisoners of war alive, and boiling their bodies to render them into pitch. Which he'll use to set the city on fire.
Season 2:
In the very intro, Genghis Khan himself appears, giving his grandson a lesson in life. It involves taking ten thousand birds he received as tribute, setting them all on fire, and releasing them to go fly back to the city they're outside, in order to burn the buildings they land on.
The coordinated suicide bombings in the Chinese city. As far as everyone is concerned, they're completely out of nowhere, and they're devastating.
After Kokachin fails to conceive after repeated efforts, Chabi takes matters into her own hands and has her raped by a stable hand.
Not long afterward, the stable hand turns up dead. Kokachin visits the place where the body is left, and all that's left is a bloody skeleton, picked otherwise clean by birds.
Kublai deals with his outnumbered strategic situation by taking a page from his grandfather's book, and setting a herd of horses on fire before leading them into the enemy's camp. All of the horses die in screaming agony. So do a lot of the enemy soldiers.
During Heirs, Jingim takes on Orus and the fight ends up with Jingim bashing Orus' skull with a rock, without the mercy of a Gory Discretion Shot. Orus's head is crushed flat when Jingim is done with him.
