One broken link is enough for the symbolism, but many use a full chain.
|Lvl 13||17,000 gp|| ||Lvl 23||425,000 gp|
When you spend an action point to take an extra action, you ignore immobilizing, restraining, and slowing effects on you until the end of your turn.
Level 23: You can also end one effect on you that is immobilizing, restraining, or slowing you.
Published in Adventurer's Vault 2, page(s) 87.