Ur-Ghast

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Ur-Ghast
Name	Ur-Ghast
Health	250 units ( x 125)
Spawn	top floor of a Dark Tower
Drops	Ur-Ghast Trophy, Carminite, Fiery Blood
Source Mod	Twilight Forest

The Ur-Ghast is a boss mob found in Dark Towers. The Ur-Ghast can be a formidable foe, as it flies high above the player and is difficult to damage with anything other than a ranged weapon. When the Ur-Ghast has taken about 50-70 damage, it will start crying, releasing tears that damage the player upon impact, acting similar to an instant damage potion. Once defeated, the Ur-Ghast spawns a loot chest containing an Ur-Ghast Trophy, some Fiery Blood and some Carminite.

The UR-Ghast crying

Dark Towers are usually found in the Dark Forest biome and are quite massive structures.

High tier armour and weapons are a must as it has a large health pool, heals, and deals a lot of damage which can be very hard to avoid. If flight is possible in your modpack/server it should be prioritized (through Morphing into a Bat, or Jetpacks from IC2, or maybe a Thaumostatic Harness from TC4 for example) as the area around the top of the tower is difficult to navigate and flight can bypass a lot of the tower maze.

The Ur-Ghast itself can be very difficult, depending on the tools that you bring. Diamond armor and weapons alone may not be enough to beat the Ur-Ghast in a single fight. It is advisable to bring some redstone and pressure plates for activating the Ghast Traps, as detailed below, as the spawned ones will frequently be destroyed by the ghast attacks. A bucket of water for putting out fires may also be useful. The Ur-Ghast also has the Rust ability, meaning it can destroy high level armor that normally cannot be destroyed, such as Nano Armor, Solar Helmets and even Modular Powersuits. It appears to deal the most damage to the helmet first.

The fight has several mechanics involving 4 areas spaced around the top of the tower with Ghast Trap blocks. Small Carminite Ghasts will be summoned around these and will then shoot some sort of beam at the Trap, possibly healing the Ur-Ghast in the process. As a result of this the Ghast Traps become charged, shown with smoke effects and a beeping alarm sound. When charged the Ghast Traps can be activated with a redstone signal which will cause Ghost Busters inspired beams above the trap, sucking in and damaging the Ur-Ghast if it is nearby, as well as killing any Carminite Ghasts in that area.

The Ur-Ghast will fly around absorbing the Carminite Ghasts to heal itself, so a good tactic is to wait nearby and activate the Trap when the Ur-Ghast gets near. Note that as the Ur-Ghast is pulled downward as part of the Traps effect you are given an opportunity to hit it with regular melee weapons. It may be helpful to construct a sheltered area to protect the redstone equipment from attacks from the Ghasts.

The IC2 Mining Laser was tested and at least in 1.20.2 it deals no damage to the Ur-Ghast.

Another tactic if you have access to flight and a large amount of ranged damage, such as 4-5 Scepters from Thaumcraft, a high level of Ars Magica, or a good bow and ammunition from Tinkers' Construct (among many others) you can "chase" the Ur-Ghast away from the tower by continually hitting it. Each hit will make it fly up and away, and by keeping it from the tower you can prevent it healing. Make sure to avoid flying below as you can be quickly killed by the Ghast Tears.