Summoning Chamber

Earnings Magic +3
Benefit bonus on Charisma, Diplomacy, Intimidate, and Knowledge (planes) checks
Create 11 Goods, 4 Influence, 10 Labor, 5 Magic (1,040 gp); Time 28 days
Size 6—16 squares
A Summoning Chamber is used to perform magical rituals to conjure outsiders. It contains a well-drawn, nearly complete magic circle on the floor—which you can complete with just a few chalk marks—suitable for use with magic circle spells, planar binding spells, and so on. A person who uses a Summoning Chamber gains a +3 bonus on Knowledge (planes) checks relating to a creature being called or summoned, and a +3 bonus on Charisma checks, Diplomacy checks, and Intimidate checks to influence or bargain with a creature called or summoned here.