After the final battle, you get the Nix and Ashes of Resurrection spell. Should you have gotten all of the spells from Horace, you should unlock the Master of Magic trophy upon getting these final two spells. Wait until the end of the credits, where you'll get an opportunity to make a Game Completed Save.
Upon loading this save, you will be put back to before the final battle with the White Witch and many new things will be unlocked. What is unlocked is as follows:
- Plenty of new Errands and Bounties are unlocked.
- Gold versions of Familiars can be encountered in dungeons, which are separate entries in the Creature Compendium. These gold familiars have some of the best items to steal in the game, which can be used to create the best items in alchemy.
- Provided you cleared Rank A in the Solosseum, Rank S is now unlocked. The one room at the Tombstone Casino is also unlocked.
- Visiting any Familiar Retreat will get you some items, which include 5 Sage's Secrets, a Healing Tear Gem, a Healing Rain Gem, a Purifying Pulse Gem, and a Sapdragon Ticket.
