In Bodhi's maze. . . at Spellhold.
There is a room where after you kill a clay golem and search the boxes, you find a rogue stone among other things.
In this site's walkthough it says:
Kill the Clay Golem within. Then you can search for treasure (trapped!):
Rogue Stone (useful if you want to go in that one Bridge door)

Does anyone know where this bridge door is, and how the Rogue stone ties into it?

Thanks

THIS IS NOT A DOUBLE POST !
This is a different question!

Someone who facilitates a forum would understand that without the proper header to entice readers, no one will answer the question. The post below does not do this. . . !

Spoiler below:

Yes you can use the rogue stone to open up a door in the, Bridge district. It is in the lower right corner. Kind of close to the tanners place.
Be ready for one tough fight. But the reward is worth it. Make sure you save before you go in. Because the only way out is to fight your way out.

is there any use with that stone besides with that of the bridge district? any other stone you can use for other quest?

<font color="gold">If you have ToB, it's smart to keep a Diamond. Not selling the Beljuril Gem is also smart.
AFAIK, those are the only ones worth not selling. ;) </font>