The Yassa laws were the laws of the Mongol Empire under the rule of Genghis Khan. After Genghis Khan died, the laws were still enforced, however it is unclear how strictly and to what extent. The Yassa are also referred to as Genghis Khan's laws.

You can read more about the Yassa laws here: Genghis Khan's laws

The Yassa were based around obedience to Genghis Khan, a uniting together of the Mongol nomad clans, and the strict punishment of wrongdoing.

The Yassa laws prescribed the death penalty for things like homosexuality, adultery, spying on the Mongol Empire, stealing a horse, and unlawful pillaging.

A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.