How do you get Beaconator in Minecraft?

Kill the Wither to get a Nether Star (see the Withering Heights guide).

What kind of advancement is Beaconator?

Beaconator is a Nether tab advancement in Java Edition, of goal type.

Beaconator

Tab: NetherGoalDifficulty: Medium

Quick answer: Bring a Beacon to full power

Tree path: Nether › A Terrible Fortress › Spooky Scary Skeleton › Withering Heights › Bring Home the Beacon › Beaconator (advancements are independent: they can be completed in any order; the tree only guides progression)

Tree parent: Bring Home the Beacon

Advancements are exclusive to Java Edition. The Bedrock Edition equivalent is achievements, which have different objectives.

How to get Beaconator

Kill the Wither to get a Nether Star (see the Withering Heights guide).
Craft a Beacon: 5 Glass, 3 Obsidian and the Nether Star.
Gather 164 mineral blocks for a full pyramid: 81 (9x9) + 49 (7x7) + 25 (5x5) + 9 (3x3). Iron, gold, diamond, emerald and netherite blocks all count and can be mixed. Iron is cheapest: 1,476 ingots.
Stack the four layers with the beacon on top, feed it an ingot or gem, and select a primary power.

Tips

A full 4-layer pyramid unlocks the secondary power (Regeneration or a level II effect). You can share one pyramid between up to 6 beacons by placing them in a 3x2 arrangement on top, which is the standard endgame base setup.

More guides from this tab (Nether): Nether Return to Sender Those Were the Days Hidden in the Depths Subspace Bubble A Terrible Fortress