My last post was based purely off what i remembered from, like, 2 videos; oh, and all of the bits and pieces of lore I've found in HK, such as the old Radiance statue at the very top of Crystal Peak, Hallownest's Crown. also, I think that PK warned the people of Hallowest that went to the left side of the Howling Cliffs that, if they left Hallownest, they would most likely lose the knowledge they gained, and their mind could be destroyed. However, the fact that Tiso heard of the Colosseum of Fools while outside of Hallownest contradicts this theory, since someone would've had to leave Hallownest after discovering the Colosseum without losing their memory or their mind.