The Ender Golem is one of Cataclym’s few mini-bosses. Defeating it is a great way to obtain Void Cores, which are used to upgrade equipment, or summon your own Void Runes in battle.
Where to Find the Ender Golem
To find the Ender Golem, you must first discover the Ruined Citadel, a large structure in the outer End. Therefore, defeating the Ender Dragon first and having access to an Elytra is recommended.
The easiest way to find the Ruined Citadel is to craft the Eye of Void. These require 2 Endstone Bricks, 2 Purpur Blocks, 2 Purpur Pillars, an Eye of Ender, and 2 Shulker Shells. In the image below, you can see the complete recipe.

This works similarly to a regular Eye of Ender. However, instead of pointing to a Stronghold, it will point to the Ruined Citadel, which only works inside the End dimension. Due to the End having the Void everywhere, it’s recommended to bring multiple Eyes as they might fall into the Void or only release it over the End islands.

Eventually, you will discover the Ruined Citadel. Surrounding the outside of the structure is Endermaptera, which are small Spider-like creatures. They are hostile and will attack players, but when killed, they will drop Void Jaws, which are used to create Void Scatter Arrows, which deal damage in a small area.

To find the Ender Golem, head into the structure and look for a room that has exposed End Stone in a circular shape in the ground. Breaking through this with a Pickaxe will take you into the lower levels of the Ruined Citadel, and you will directly enter the room with the Ender Golem.
Though digging down anywhere will take you to the Ender Golem, multiple can be found per Ruined Citadel. There is also plenty of Chests to search for items like Enchanted Equipment or Diamonds.
Fighting the Ender Golem
The Ender Golem isn’t actually a boss but more of a mini-boss. For that reason, you’ll notice no boss bar at the top of the screen. So to see the health of the Ender Golem, you might want to install a mod like ToroHealth Damage Indicators.

Instead, the leading defender of the Ruined Citadel is the Ender Guardian. However, you will encounter this later. In total, the Ender Golem has 150 Health, and 12 Armor. There are three different attacks, which are a standard melee attack (10 – 14 damage), an Earthquake attack (10 – 16 damage), and a Void Rune attack (10 – 14 damage).
Generally, the Ender Golem is relatively easy to defeat. Keep chipping away at its health using your Sweeping Edge attacks. A great weapon to use is the Infernal Forge, as each time the special attack comes off cooldown, you can deal ten damage.

After defeating the Ender Golem, it will drop a Void Core. When holding this, you can right-click to summon Void Runes, dealing damage to enemies in front of you. However, it can also be used inside the Mechanical Fusion Anvil, allowing you to upgrade the Infernal Forge or Wither Assault Shoulder Weapon, giving them some Void Rune abilities.