Champion Spawn Artifacts lists the new drops for champions

From UOGuide

The Acolyte Armor Set also know as the Greymist Armor Set is part of a 4 piece Set that imparts additional properties when the entire set is equipped. Introduced with several other Item Sets by the Mondain's Legacy expansion. when complete the set changes hue.

Each individual armor piece has the same modifiers. When completely assembled, the total armor modifiers are as follows:

• Physical Resist: 40
• Fire Resist: 40
• Cold Resist: 24
• Poison Resist: 28
• Energy Resist: 28

• Mana Increase: 8
• Spell Damage Increase: 8%
• Self Repair: 3
• Luck: 100 (total)
• Night Sight

See Also

• Greymist Armor Chest
• Greymist Armor Legs
• Greymist Armor Arms
• Greymist Armor Hands