Infernal Bargainer

Outsider,

Whenever you cast commune, contact other plane, legend lore, or vision, you gain +2 caster level because you are known to the entities answering your entreaties. Whenever you cast any planar binding or planar ally spell, you can call an evil creature 2 HD higher than normally allowed. Any evil creature caught in a planar binding trap you create has a -2 penalty on all attempts to escape.

Whenever you cast commune, contact other plane, legend lore, or vision, you gain +2 caster level because you are known to the entities answering your entreaties. Whenever you cast any planar binding or planar ally spell, you can call an evil creature 2 HD higher than normally allowed. Any evil creature caught in a planar binding trap you create has a -2 penalty on all attempts to escape.

You are comfortable making deals with powerful entities from the Lower Planes.