Green Dragon Lineage( Dragon Magic, p. 19)
Your link to your green dragon ancestors allows you to weaken the wills of others.
Draconic Heritage (DM) (green) , sorcerer level 3rd,
As a standard action, you can spend an arcane spell slot to impose a penalty on the next Will save made by one living creature within 30 feet. The penalty is equal to the spell slot's level and lasts until the creature attempts a Will save against an effect that is not harmless or until the end of your next turn, whichever comes first. Multiple uses of this ability don't stack. This is a mind-affecting enchantment (compulsion).