Mask FocusSource Arcane Anthology pg. 14
You can use your mask as an additional focus for your arcane spells, enhancing their power.
Prerequisites: Extend Spell, Nameless One, ability to cast 3rd-level arcane spells.
Benefit: While benefiting from the Nameless One feat (see below), the mask that you wear in order to gain the benefits of that feat satisfies the focus component of any spell you cast that requires a mask, such as eyeless vision. In addition, once per day you can apply the Extend Spell metamagic feat to an arcane spell without increasing the spell’s level by adding your mask as a focus component. When Extend Spell is applied in this manner, its increase to duration applies only to effects that target you; other creatures use the spell’s normal duration. For example, if you use this ability on the haste spell, the spell’s effects last twice as long for you, but not for any other creature that you target with the spell.