Time: Any
Frequency: Whenever you cast a thaumaturge spell
World name: Ultros
Character name: Rado Banado
NPC name: n/a
Monster name: any
Class/Level: Any THM/BLM
Party or solo: Always
In-game time: Always
Area and coordinates: Everywhere
Steps:
1. Be BLM/THM, equip Stardust Rod Atma (works with any though!)
2. Target an enemy
3. Cast Fire I

Result:
http://i.imgur.com/eiPqP8Q.jpg
As you can see, the particle effect exists outside the staff, whereas it used to be inside the staff's orb.