Urschleim is an optional end-game boss found within the Passage.
Summoning
Urschleim can be found about 1240-1280 tiles from The Core in the Passage. A loud rumbling sound can be heard and the screen will begin to shake when Urschleim is nearby.
An Urschleim Scanner can be used to reveal its location on the map.
Once defeated, Urschleim can be re-summoned by using a Primeval Slime Cell anywhere in the Passage.
Behavior
Urschleim is a giant mass that stretches across the Passage. It slowly moves clockwise through the biome, traveling through (but not destroying) any obstacles in its path. It does not have any typical attacks, but will instantly kill the player upon contact.
Urschleim has 3 glowing bulbs on its front which when destroyed reveal its head that can be damaged for a short period of time, after which the head will retract, the bulbs will respawn, and the fight will continue. The player will have to repeat this until Urschleim's main body dies. Urschleim's health loss during each vulnerable period is soft-capped at 25% max health, meaning that player has to destroy all the bulbs at least four times to defeat Urschleim.
Drops
| Item | Amount | Chance per roll | Chance for one |
|---|---|---|---|
 Urschleims Chest | 1 | 100% | |
 Giant Mitochondrion | 1; +1 | 100% | |
| 1 roll of the following 4 items | |||
 Squishy Egg | 1 | 14.29% | |
 Sulfossil Helmet | 1 | 28.57% | |
 Sulfossil Cuirass | 1 | 28.57% | |
 Sulfossil Boots | 1 | 28.57% | |
| 5 rolls of the following 11 items | |||
| Squishy Egg | 1 | 4.69% | 21.37% |
 Sulfur Bomb | 5–8 | 7.04% | 30.59% |
 Cytoplasm | 6–12 | 14.08% | 53.19% |
 Calcified Shell | 1–4 | 14.08% | 53.19% |
| Sulfossil Helmet | 1 | 9.39% | 38.92% |
| Sulfossil Cuirass | 1 | 9.39% | 38.92% |
| Sulfossil Boots | 1 | 9.39% | 38.92% |
 Urschleim Figurine | 1 | 3.76% | 17.42% |
 Jungle Emerald | 1 | 9.39% | 38.92% |
 Desert Ruby | 1 | 9.39% | 38.92% |
 Ocean Sapphire | 1 | 9.39% | 38.92% |
Notes
- Urschleim's outer shell cannot be damaged; only the glowing bulbs and its head. Also, it cannot be damaged from behind (Actually can but only with the Stormbringer), as short range attacks are out of reach, while long range attacks will dissipate or bounce away upon hitting its back as if they have hit a block.
- If the player dies in combat, Urschleim itself (the head) will restore to full health, but its bulbs will not.
- In multiplayer, Urschleim gains additional health depending on the amount of players in the world. It will automatically adjust whenever a player joins or leaves the world.
Players Max health Casual Standard Hard 1 124913 (body)
8940 (bulb)249826 (body)
17880 (bulb)374739 (body)
26820 (bulb)2 217486 (body)
15565 (bulb)434972 (body)
31131 (bulb)652458 (body)
46696 (bulb)3 300819 (body)
21530 (bulb)601637 (body)
43059 (bulb)902456 (body)
64589 (bulb)4 378665 (body)
27101 (bulb)757331 (body)
54202 (bulb)1135996 (body)
81303 (bulb)5 452672 (body)
32398 (bulb)905344 (body)
64795 (bulb)1358016 (body)
97193 (bulb)6 523756 (body)
37485 (bulb)1047511 (body)
74970 (bulb)1571267 (body)
112455 (bulb)7 592497 (body)
42405 (bulb)1184994 (body)
84810 (bulb)1777491 (body)
127215 (bulb)8 659295 (body)
47186 (bulb)1318590 (body)
94371 (bulb)1977884 (body)
141557 (bulb)
Achievements
 | Cambrian Behemoth • "Defeat Urschleim" (Bronze • 25 G • 25 XP) Defeat Urschleim for the first time. |
Tips
- Range weapons can be really useful when destroying the glowing bulbs since Urschleim moves in the same pattern.
- It is recommended to either clear a long path through the Passage or memorize the natural path through the biome to avoid being killed by Urschleim while fighting it.
- See Here for a detailed guide on how to defeat Urschleim.
Trivia
- Urschleim's name is German and can be translated as "primordial slime" or "original slime".
Gallery
History
- 1.0.1.11: Should no longer automatically respawn when re-loading a world where it was defeated.
- 1.0.1.4: Particles are now correctly disabled on low particle quality.
- 1.0.0.14: Melee pets and minions can now damage Urschleim's head.
- 1.0.0.1: Introduced.
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