Terraria Map
Stats
| Classic | Expert | Master | |
|---|---|---|---|
| Life | 34 | 68 | 102 |
| Contact damage | 25 | 50 | 75 |
| Defense | 4 | 4 | 4 |
| Knockback resistance | 0% | 10% | 20% |
| Coin value | 1 silver | 2 silver 50 copper | 2 silver 50 copper |
Where and when it spawns
- Biomes
- Caverns
Drops
| Item | Chance | Amount | Modes | Condition |
|---|---|---|---|---|
 Jellyfish Necklace | 1% (1 in 100) | 1 | All modes | |
 Glowstick | 100% (always) | 1–4 | All modes | |
 Blue Jellyfish Kite | 2% (1 in 50) | 1 | All modes | Drops on Windy Days |
Chances are for one kill, before Luck, Rate of fire or banners change anything. The Modes column says in which difficulties the game lists the drop.
Bioluminescent drifters in submerged cavern pools
Blue Jellyfish dwell in water pockets scattered throughout underground cavern systems. Holding 34 life and 4 defense, this glowing creature deals 25 contact damage, increasing to 50 in Expert and 75 in Master. While drifting slowly, it emits a soothing blue light that illuminates murky waters, serving as both an environmental lantern and a warning of submerged danger.
Gathering underwater necklaces and glowing torches
Swimming without mobility items like the Flipper makes fighting Blue Jellyfish awkward, so attacking them from the shore with bows, yo-yos, or spears is the safest tactic. Slaying a Blue Jellyfish drops Glowsticks at a 100% rate (1–4 units), the Jellyfish Necklace at 1% to boost underwater visibility, and the Blue Jellyfish Kite at 2%.
Trivia
- Blue Jellyfish illuminate deep subterranean pools naturally, aiding miners looking for underwater chests.