From The Heroes of Might and Magic III wiki

The artifacts that can be equipped in these slots are many, and have different powers, but the ones boosting Secondary Skills are in the majority. The artifacts equipped in this slot are:

• Spell Scroll

• Cards of Prophecy
• Clover of Fortune
• Ladybird of Luck

• Badge of Courage
• Crest of Valor
• Glyph of Gallantry

• Speculum
• Spyglass

• Angel Feather Arrows
• Bow of Elven Cherrywood
• Bowstring of the Unicorn's Mane

• Bird of Perception
• Emblem of Cognizance
• Stoic Watchman

• Charm of Mana
• Mystic Orb of Mana
• Talisman of Mana

• Orb of Driving Rain
• Orb of the Firmament
• Orb of Silt
• Orb of Tempestous Fire

• Hourglass of the Evil Hour
• Spirit of Oppression

• Tome of Air
• Tome of Earth
• Tome of Fire
• Tome of Water

• Golden Bow
• Orb of Inhibition
• Orb of Vulnerability
• Sphere of Permanence
• Vial of Lifeblood

• Inexhaustible Cart of Ore
• Inexhaustible Cart of Lumber
• Endless Purse of Gold
• Endless Bag of Gold
• Endless Sack of Gold
• Everpouring Vial of Mercury

• Legs of Legion
• Loins of Legion
• Torso of Legion
• Arms of Legion
• Head of Legion

• Bow of the Sharpshooter
• Cornucopia
• Elixir of Life
• Shackles of War
• Statue of Legion
• Vial of Dragon Blood
• Wizard's Well