Taizhong and his Empress... one was crazy and one was dead.
As their descendants didn't want to reveal that Taizhong was still alive, they set up this area as a restricted zone and anyone who entered would be killed. No one really cared about the rumors that spread on the outside.
Taizhong had been smart for his whole life but he probably didn't expect that his later years would be so sad and tragic.
Old Ancestor Duanmu, who had fought him for his whole life, didn't suffer any serious illnesses and disasters and befriended the Soul Raising Tree, peacefully spending the latter half of his life.
As for him, he enjoyed glory and riches for the front half of his life, but then he spent the next half on the verge of madness.
"You bald camel, you actually dared to enter my sleeping palace. You deserve to be beaten up! You are asking to die!" Taizhong hollered in rage. He really wanted to punch Heaven Heart.