The Yeti's treasure vaults

[merest]

So we know the yetis are the keepers of the infinimap, yeah? I've been thinking a bit, though, about what other things they might have. 

•  a book that will write out the true and complete life's story of anyone who bleeds on its pages, up to the present moment in which they donate to the book. It has a limited number of pages, however, and currently sits at about 2/3s full. Yeti lords have historically used it to record the actions and deeds of their reign. 
• Singing bones, the song is only audible upon contact, and prolonged touch will eventually lull the user to sleep. Once asleep, the affected person will dream of the death which resulted in the bone's creation, over and over, until an outside force removes contact. 
• A  3X3, perfectly square container of pure darkness, visibly ripped off some larger whole. Placing ones hand inside will cause it to tingle. 
• A mirror that reflects a person that both is and isn't you. 
• Ancestral weapons preserved after the second death of their owner. 
• A maze game that, when used, will force the user into the perspective of the toy ball. 
• A lonely echo, which will attempt to attach itself to anyone who comes too close.