You are the descendant of silver dragons and can harness your ancestors’ power to paralyze your opponents.
Prerequisites: Draconic Heritage (silver), sorcerer level 3rd.
Benefit: 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.
Source: Dragon Magic, page 22.