These are the best artifacts in the game. They can only be found by visiting obelisks to reveal a place to dig. Digging there will earn you one of the following ultimate artifacts.
Ultimate artifacts are similar to those that affect a hero's primary statistics (attack, defense, spell power, and knowledge), except that they are much more powerful. They have the same effect, but to a greater extent.
Ultimate Sword of Dominion: attack +12
Ultimate Cloak of Protection: defense +12
Ultimate Wand of Magic: spell power +12
Ultimate Book of Knowledge: knowledge +12