Silver Dragon Lineage( Dragon Magic, p. 22)
You are the descendant of silver dragons and can harness your ancestors' power to paralyze your opponents.
Draconic Heritage (DM) (silver) , sorcerer level 3rd,
As a standard action, you can convert an arcane spell slot into a paralyzing blast. All adjacent enemies are paralyzed for 1 round. A successful Fortitude save (DC 10 + the spell slot's level + your Cha modifier) negates the effect.