Boss Guide · Dark Forest Center · 1.21.1 & 26.1.2
Twilight Forest Ur-Ghast: Dark Tower Climb and Boss Fight
The Twilight Forest Ur-Ghast floats at the top of the Dark Tower. Here is how to climb past locked doors and Carminite machines, charge the Ghast Traps, and win the fight.
Last checked: October 31, 2026 · Works for 1.21.1 and 26.1.2 builds
The Twilight Forest Ur-Ghast is a giant red ghast that waits at the top of the Dark Tower, in the middle of the Dark Forest. You cannot simply shoot it down. It takes no fire damage, it spends long stretches crying where it takes almost no damage, and it floats through walls. The fight is won with the Ghast Traps built into its room. Getting there is half the work, because the Dark Tower is a vertical puzzle of Carminite machines, locked doors and vanishing floors.
250
Health
Most health of any boss in the Dark Forest branch.
Dark Tower
Location
Dark Forest Center biome, ringed by Dark Forest.
Knight Phantoms
Requires
Tower is protected and dark until all six die.
Highlands
Unlocks
One of three bosses needed to open them.
Climbing the Dark Tower, stage by stage
Think of the tower as four stages. Each one asks for something different.
Stage 1: Reach the Dark Forest Center
Walk inward from the Dark Forest until the trees change and the huge tower comes into view. If you have not beaten the Knight Phantoms, you get a darkness effect here and the tower blocks cannot be broken. Finish the stronghold first.
Stage 2: Clear the lower floors
The base is made of Towerwood planks. Some are Infested Towerwood that hide Towerwood Borers, which drop Borer Essence. Carminite Golems, Carminite Ghastguards, Broodlings, Pinch Beetles, Kobolds and vanilla Witches, Skeletons and Creepers all spawn inside. Light every floor you clear.
Stage 3: Collect the Tower Keys
The main shaft is barred by Locked Vanishing Blocks. Tower Keys sit in chests inside the smaller side towers that branch off the main one. Right-click a locked block with a key to unlock it, then right-click again or power it with redstone to make the whole connected wall vanish.
Stage 4: Use the machines to go up
Interior floors are either mazes of Reappearing Blocks or gaps you cross with Carminite Builders. Antibuilders on some floors erase built blocks nearby, so cross those parts quickly. The table below explains each device.
Tower machines and what they do
Most of these respond to a redstone signal or a right-click. Carry a stack of levers and buttons.
| Device | Trigger | Effect |
|---|---|---|
| Vanishing Block | Right-click or redstone | Disappears and sets off every vanishing block touching it. Gone for good. |
| Locked Vanishing Block | Tower Key, then right-click | Stays solid and resists explosions until unlocked. |
| Reappearing Block | Right-click or redstone | Vanishes for about 4 seconds, then returns. Used as maze doors. |
| Carminite Builder | Redstone power | Places a line of temporary blocks in the direction the nearest player faces, up to 16 blocks. Look up to build up. |
| Antibuilder | Always on | Removes built blocks around it. |
| Carminite Reactor | Redstone power | Eats nearby blocks into debris for about 17 seconds, then explodes with fire and spawns Ghastlings. |
| Ghast Trap | 3 Ghastling kills nearby, then redstone | Pulls ghasts above it down and damages them. Key to the boss. |
Craft your own. A Carminite Builder is 4 Encased Towerwood, 4 Carminite and a Dispenser. A Carminite Reactor is 4 Encased Towerwood, 4 Carminite and Redstone Ore. Carminite itself crafts from 4 Borer Essence, 4 Redstone Dust and 1 Ghast Tear, so you do not have to wait for the boss to start building.
How to beat the Ur-Ghast boss
The boss room has several Ghast Traps around the edge. The whole fight is a loop around them. Bring a strong melee weapon, a bow for Ghastlings, levers, and blocks to make cover.
- When the Twilight Forest Ur-Ghast is calm, it shoots large fireballs. Punch or hit them back. Reflected fireballs are the one kind of fire that hurts it.
- After it takes a bit of damage, it throws a tantrum: it cries red tears, lightning flashes, and it summons Carminite Ghastlings around two of the traps. While crying it takes only one tenth of normal damage, so do not waste swings on it.
- Kill three Ghastlings close to one trap. The trap starts to glow and draws redstone lines toward dying ghastlings when it is charging.
- Flip a lever or press a button next to the charged trap. After a short spin up, it pulls any ghast hovering above it down toward the trap, ends the tantrum and deals damage on its own.
- While the Twilight Forest Ur-Ghast is pinned, hit it with your sword. The pull lasts about six seconds.
- Repeat until its 250 health is gone. Each new tantrum brings fresh Ghastlings to recharge the traps.
Troubleshooting the Dark Tower and the boss
| Problem | Cause | Fix |
|---|---|---|
| Ghast Trap does nothing when powered | It is not charged | Kill three Ghastlings within about 10 blocks of that trap first, then apply power. |
| Arrows and fire do no damage | Ur-Ghast is immune to fire and nearly immune while crying | Use reflected fireballs and melee while it is trapped. |
| Cannot break tower blocks | Knight Phantoms not beaten | Clear the Knight Stronghold. The protection lifts. |
| Builder blocks vanish under you | Antibuilder nearby or power cut | Keep the signal on and move past Antibuilders fast. |
| A door will not open | Locked Vanishing Block | Find a Tower Key in a side tower chest. |
| Your base got blown up | Carminite Reactor | Never power one near anything you want to keep. |
Twilight Forest Ur-Ghast drops: Carminite and Fiery Tears
When the Twilight Forest Ur-Ghast dies, a red trail floats from its body to the spot where its loot chest appears. The chest holds Carminite, Fiery Tears and the Ur-Ghast Trophy. The walk back down is long, so take everything at once.
Carminite
Powers your own Builders, Reactors and Ghast Traps. A Block of Carminite stores nine.
Fiery Tears
Works the same as Fiery Blood for Fiery Ingots. See the Fiery Blood and Fiery Tears guide for the full crafting tree.
Ur-Ghast Trophy
Proof of the kill. It counts toward opening the Highlands with the Hydra and Snow Queen.
Beating the Hydra, the Ur-Ghast and the Snow Queen clears the Highlands. See where each one fits on the Twilight Forest boss order page, or go back to the mod overview. Get the mod from its official CurseForge page.
Common Questions
Why does the Ur-Ghast keep crying?
Crying is its tantrum phase. It starts after the boss takes some damage, cuts all damage it takes to one tenth, and summons Ghastlings at two traps. A charged Ghast Trap ends the tantrum.
Can I kill the Ur-Ghast with a bow?
Not efficiently. Arrows work while it is calm, but the crying phase makes ranged damage almost useless. Reflected fireballs and melee during a trap pull do most of the work.
Where do I find a Tower Key?
In chests inside the small side towers attached to the main Dark Tower. Look for the towers that branch off at the sides as you climb.
Can I make Carminite without fighting the boss?
Yes. Craft it from 4 Borer Essence, 4 Redstone Dust and 1 Ghast Tear. Borer Essence drops from Towerwood Borers hiding in Infested Towerwood.
Does the Ur-Ghast fly through walls?
Yes. It ignores block collision, so walls do not trap it. Building cover protects you from fireballs but will not pin the boss in place.