The ultimate goal of Grandmaster Mode is to substantially increase the general difficulty and stunt the progression of the game while maintaining a vanilla playthrough style. I have listed the main additions and buffs here: 6 New Ender Dragon Attacks, Protection 5 Enchantment, 3 randomly occurring events (Random Raids, Pandemics, and Insomnia), All Mobs Significantly Buffed, Creepers make ambient sounds, 4 New Wither Attacks, 1 New Dangerous Creeper Variant, Elder Guardian Buffed, Ender Pearls are now only obtainable from Endermen, and anew Endgame gear set. Explore for yourself, and make sure you get the right preparations for the end fight!