The player has a small chance to not jump when they try to jump. This has a base 0.1% chance of triggering, but it increases based on things on your person.
+0.1% per item of leather armor
+0.25% per item of non-leather armor
+10% if the player is affected by any slowness effect (applied only once, even if the slowness is higher rank)
Hatcrafter's idea:
The player has a small chance to not jump when they try to jump. This has a base 0.1% chance of triggering, but it increases based on things on your person.