Fiendish Summoning Specialist

(Planar Handbook, page 39, DnD 3.5)

[General]

You can select from a larger number of options when summoning evil creatures.

Prerequisite

Knowledge (the planes) 2 ranks, Knowledge (religion) 2 ranks, Nongood alignment, ability to cast any summon monster spell

Benefit

Add one evil-aligned creature to the list of creatures for each summon monster spell that you can cast. (Work with the DM to select creatures appropriate to the spell's list of summonable creatures.) Each time you gain the ability to cast a new summon monster spell, you may add one evil-aligned creature to the list.

Normal

Without this feat, adding a creature to your summoning list requires you to remove one that is already on the list.