Mastery of Twilight Denizens

(Player's Guide to Eberron, page 126, DnD 3.5)

[General]

You have learned to calculate the precise location of Lamannia at any given time, and to use that knowledge to summon more powerful creatures from that plane.

Prerequisite

Extend Spell, Knowledge (the planes) 2 ranks, Spellcraft 4 ranks

Benefit

When you cast a spell that summons one or more creatures noted as an inhabitant of Lamannia (see page 97 of the EBERRON Campaign Setting), you can spontaneously apply the effect of the Extend Spell metamagic feat to that spell. Doing this has no effect on the spell's level or casting time.