Ascending Magic Items
Ascending magic items work like normal magic items, but they gain new powers as their wielders gain levels, and their existing powers sometimes also improve. Additional item powers appear in a ascending magic item’s entry with a header indicating the character level at which they unlock.
The caster level of the item ascends as well. An Ascending item’s effective caster level is equal to the character level/hitdice of its wielder, to a maximum of 20th Level.
Each Ascending item has a base price that represents its value to a character whose level has not accessed any of the ascending powers.
All Ascending Items take 24 hours to come into Accordance with a new user until this time the item only grants its base powers.
To craft or modify Ascending Items refer to this link Ascending Items