Minecraft wiki entry for Things_not_to_do, associated text: Ocean monuments are dangerous to an unprepared player. Guardians spawn in them, which do 4.5 hearts of damage on hard, and 3 elder guardians, which inflict Mining Fatigue III to the player, which makes breaking blocks nearly impossible, even when an inflicted player uses a netherite pickaxe with efficiency. The proper equipment for some players is: