Quote Originally Posted by Tvtyrant View Post
Binding Elder Evils
The Elder Evils are designed to act as living apocalypses; things from outside of the normal rules of reality who are meant to be the centers of entire campaigns. Many of them are Outsiders, however, and can be bound by a hero or villain with more bravery than sense. From a flavor point of view they are wonderful binds, evoking a sense of Lovecraftian madness.

Elder Evils have several useful traits in common, including maximized HD and a number of immunities. Maximized HD are especially nice for a caster binding outsiders, as it grants them significant HP despite relatively low HD (some of them have extremely high HD, and are outside of this mini-guide.) They are also universally anti-divine, thematically and mechanically. This makes them unlikely for a divine caster to gain one through Planar Ally, but does not prevent an arcane caster from binding them. It should also be noted that divine casters may not accept binding such a creature, as it is to their detriment and the Elder Evil is likely out to eat their god.

The Hulks of Zoretha and Zargon the Returner are callable by a normal caster using Greater Planar Binding pre-epic, while the Aspect of Sertrous and Father Llymic can be called using the spell Implore (Dragon Magazine #336).
Truenaming is required for Implore. So I'm not sure it is a possibility.

Did you forget there are Elder Evils in Lords of Madness book?
1) Batholomogg
2) Holashner
3) Pisceathces
4) Shortotugg
5) Y'chak

Don't forget you can also Lesser Bind Brood spawn Ogres or Worgs (as they are presented as an option)

How does anyone make the DC 39 Str check to remove the horn?
You'd need a +19 Str bonus to have a chance on a 20...38 Str!