Biolab 4¶
Bio Laboratory 4 (also known as Lighthalzen Dungeon 4) is one of the most challenging locations in World of Your Dream, where players face clones of real characters with third job classes. It is inhabited by extremely powerful monsters with strong skills, high attack speed, and advanced AI, making it a tough challenge even for well-organized parties. The location attracts players with rare loot and the chance to obtain valuable cards.
How to get there¶
The entrance to Bio Laboratory 4 is located in the bottom-right corner of the Bio Laboratory 3 map (/navi lhz_dun03 240/76).
Monsters¶
The table includes only regular mobs; mini-bosses and MVPs are not included.
| Monster | Quantity | In-game command |
|---|---|---|
 Randel |
42 | @mi 2221 |
 Flamel |
42 | @mi 2222 |
 Celia |
81 | @mi 2223 |
 Chen |
42 | @mi 2224 |
 Gertie |
57 | @mi 2225 |
 Alphoccio |
42 | @mi 2226 |
 Trentini |
42 | @mi 2227 |
MVP Tomb
The Bio Lab 4 MVP has a permanent tomb at a fixed spot on the map, showing the last killer, the top damage dealers and the time of death. Its respawn timer survives server restarts, and it is not listed on Convex Mirror.
Ghost Chill and Blood Thirst¶
On the first floor of Bio Lab, you’ll find an NPC called BioShop (/navi lhz_dun01 142/289). He lets you trade Blood Thirst — dropped by monsters in Bio Lab 4 — for Ghost Chill and various equipment.
Particle Box and Sinister Energy Particle¶
Each monster in Biolab4 has a chance to drop a 
Sinister Energy Particle, which can be exchanged in the shop for a 
Particle Box.
Just a few steps away, you’ll find another NPC named Fred (/navi lhz_dun01 137/289), where you can exchange 100 Ghost Chill and 5 RLE (Ragnarok Limited Edition) items to get a slotted version of RLE gear.
