Buff
Slow
Slow is a Terraria buff. 7 NPCs can inflict it: 
Brain of Cthulhu, 
Creeper, 
Deerclops and 4 more.
What it does
Movement speed is reduced
Type
- Debuff: it harms you.
Inflicted by
| Source | Chance | Duration | Conditions |
|---|---|---|---|
| Brain of Cthulhu | 11/243 (4.53%) | In Expert or Master Mode | |
| Creeper | 11/81 (13.6%) | In Expert or Master Mode | |
| Deerclops | Every time | 12 seconds | |
 Mummy | 1 in 8 (12.5%) | 15 seconds | |
 Pixie | 1 in 8 (12.5%) | 15 seconds | |
| Shadow Beam (projectile) | Every time | 5 seconds to 15 seconds | Unless the player has Journey godmode on |
 Skeletron | 1 in 2 (50%) | 0.5 seconds to 0.98 seconds | In Expert or Master Mode |
 Wraith | 1 in 8 (12.5%) | 15 seconds |
Chance is for each time the game tries to apply it. Duration is the time the game code sets.