Star Shrine

The Star Shrine is an area accessed from the top of Star Hill in Mario & Luigi: Partners in Time. Mario, Luigi, Baby Mario and Baby Luigi come here looking for Cobalt Star Shards, the last two, to be exact. The place has many stars floating in space, and is similar to Star Hill. A living, star-shaped gate also resides here.

Elder Shrooboid, the boss of this world, Shroobifies Toadbert and Kylie Koopa during events captured in this area. Mario and company defeat Elder Shrooboid and get the last two Cobalt Star Shards here.

Just as Star Hill is presumed to be the same area as Shooting Star Summit, it may be possible that Star Haven and the Star Shrine are also the same area, or at least, the Star Shrine is a part of Star Haven. This can be supported by their similarities and the means of getting there (from the summit of the mountain).