So the metamagic exploit known as Fate irresistible comes from a countryside setting known as KoK (Kingdoms of Kalamar), a relatively unknown setting. If you have metamagic prowess Envelop the Wall and Maximize Spell and have a Spellcaster level 7 or higher, you can qualify for this feat.
Irrestible Spell has the following advantages:
Spells you cast that normally allow a save throw do not allow a save throw. An irresistible spell uses a spell location 4 times higher than the actual spell level.
A friend of mine says there was an errata about it that changes the effect so that it adds a +10 to the domain controller instead. Does anyone know where this errata can be found or is called?
I can not for life find a reference to that.