From Pathfinder #191: The Destiny War, which isn't enabled.

The Keep

ITEM 20

UNIQUE ARTIFACT HARROW-COURT INVESTED MAGICAL

Usage carried

Bulk —

Suit Hammers (Str)

Alignment neutral good

The Keep represents steadfastness and being unshakable to threats. As long as The Keep is invested, you gain a +2 item bonus to saving throws against fear effects. Whenever you become Frightened, reduce the condition value by 1 (to a minimum of 0). If you are 20th level, the item bonus increases to +3.

Activate envision, Interact

Frequency once per day

Effect You cast Planar Palace. The rank of the spell is one-half your level, rounded down (minimum 7th level), and the interior of the mansion appears to be the inside of a resplendent keep made of stone.

Pathfinder #191: The Destiny WarOGL