Alterations require blown leaves. Conjuration-Summonings require a bit of food that the animal will like. Divinations are in silver ore. Enchantments and charms require quartz crystals. Cloud-evocations require a treebranch struck by lightning.
Necromancy requires a bone.
Referees might not want players to realize that they have entered the Happy Hunting Grounds. Depending on the site of arrival, visitors might simply recognize a world where animals live as happily as we sometimes pretend they do. So live your life that the fear of death can never enter your heart. Love your life, perfect your life, beautify all things in your life. Seek to make your life long and its purpose in the service of your people.