How to Defeat the Elder Guardian
The Elder Guardian guards every ocean monument and slaps you with Mining Fatigue III the second it sees you. Clear the debuff with milk, dodge its charged laser, and burst its 80 HP before it kites back into open water.
The whole fight hinges on one loop: the moment Mining Fatigue III landsdrink milkre-equip your sword, and dump damage. The guardian only has 80 HP, so a cleared loadout erases it in seconds. The laser is the only real threat once your attack speed is restored, and that is fully avoidable by breaking line of sight behind a prismarine pillar during its ~3.4s charge. Stay submerged with Respiration and Depth Strider so movement never becomes the problem, and never melee through its extended spikes.
Quick answers
+How much health does the Elder Guardian have?
+How do I remove Mining Fatigue?
+Can I avoid the laser?
+Should I fight it underwater or drain the monument?
+Does the spike defense hurt me?
+Why kill the Elder Guardian at all?
Mining fatigue is the real fight
The curse hits you before you see it
An elder guardian applies mining fatigue across a wide area, and it lands whether or not you have found the guardian. That is why a monument raid without a plan turns into swinging a pickaxe at prismarine forever, and why the first job is finding the three guardians rather than starting to dig.
Milk clears it, briefly
Drinking milk removes the effect, and the guardian reapplies it on its own schedule, so milk is a way to get a job done rather than a cure. Carrying several buckets and doing the digging in bursts between applications is the practical approach.
The spike damage punishes melee
Guardians reflect damage with their spikes when extended, so hitting one at the wrong moment hurts you. Waiting for the spikes to retract, or fighting from outside their range, turns the fight from a race against your own health bar into a slow but safe one.
Blocks and items in this guide
Netherite Sword
Splash Potion
Milk Bucket
Sea Lantern
Gold Block
Prismarine
Lantern
TridentAll 8 of these are named in the guide above, starting with Netherite Sword. Look them up in the item database.