Minecraft wiki entry for Defeating_a_monument, associated text: Each monument also contains three elder guardians. They have 80 × 40 health and a somewhat stronger laser attack which deals 8 points of damage, but move slowly and infrequently. They also inflict any player within 50 blocks with Mining Fatigue III for 5 minutes. In Java Edition, the elder guardians check for nearby players to afflict every 60 seconds. In Bedrock Edition, they afflict players immediately without waiting, so if you try to defeat a monument in Bedrock edition, you can count on being afflicted with Mining Fatigue 100% of the time until all three elder guardians are killed.