The Tallest Peak of the Astronomer's Oak is, of course, the legendary perch for leaders and medicine cats only. It is not as sacred as the meeting place for medicine cats every moon, or the Clans' meeting place for sharing tongues at the same pace of time - but it is special to CosmoClan, and they seem to get answers from StarClan there. If any cat dared to climb up there, they must learn from the cats who live in fear of StarClan after falling and living a life of pain or even death afterwards.