In the Savanna biome it would be interesting to add creatures such as lions. Lions naturally are higher on the animal food chain which would cause other mobs to be fearful or distant to lions. Also the lion naturally could hunt pigs but not other mobs to keep the lion from being over powered. However, Lions would be considered aggressive creatures that IF killed drop a lions mane. The lions mane item would be able to be worn on the player and would grant immunity from hostile mobs but not mobs like the wither or dragon. This new item would be a great tool for survival players.
(please add to this thread cool ideas that would go along with a savanna themed update) be creative! (: make it your own