Copper Dragon Lineage( Dragon Magic, p. 16)
You have learned to channel the powers of your copper dragon ancestry to hinder your enemies' mobility.
Draconic Heritage (DM) (copper) , sorcerer level 3rd,
As a standard action, you can spend an arcane spell slot to create a 20-foot-radius burst of magical energy centered on you. All enemies in that area are slowed (as the slow spell) for a number of rounds equal to the level of the spell slot unless they succeed on a Fortitude save (DC 10 + the spell slot's level + your Cha modifier).