what do you all think about a home brew item that creates a sub diminsion where no matter how long you are in the dimension, only 1 minutes passes in game? Thoughts?? Yes , No. To powerful?? How much it might cost??any thoughts at all?? Please and thank you.

If it can be used once and you have to wait a day to use again? Sure. As a Legendary item.

Without that limit? Nope, way too OP.

I could see this as a legendary item, but as said above, a cooldown would be necessary. Once per dawn would probably be the best bet. Alternatively, you could attach a curse to the item, or give it a cost that must be spent in order to use it. However, having a curse on a legendary item is odd, and a cost is a little awkward, so I would probably stick with just the cooldown option.

If there were to be a cost, draining a user's life energy and shortening their lifespan could be cool, and fitting to the theme.

check out the rod of security, probably the closest item that I can think of to what you're trying to do.