The White Dragon Helm should only have 10 Magic Resist but instead have a worn "Endure Magic" buff which provides the additional 20 MR to meet the current 30 MR total.
https://web.archive.org/web/20011224...html?item=6766
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				White Dragonscale Helm  
LORE ITEM MAGIC ITEM 
AC: +22 Str: +10 Sta: +12 Dex: +15 Magic Resist: +10 Fire Resist: +10 Cold Resist: +10 Poison Resist: +10 Disease Resist: +10 HP: +100 Mana: +60 
Weight: 1.5 
Classes: All Classes 
Races: All Races 
Inventory Slot: Head 
Velious Required: Yes 
Can be stored in Small and larger containers 
Last updated: Tue Oct 2 11:30:35 2001 
Effect: Endure Magic 
Type: Permanent 
Charges: Unlimited 
Average Price: 400,000pp Pricing Data... 
Rarity: Common 
Level to Attain: 55
			
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 Like the Zlandicar Heart (Regeneration worn effect), the worn effect should be passive and always function (I.E. Not a clicky), and also stack with everything including Endure, Resist or Group Resist Magic.
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				It does stack with Resist Magic. Permanent effects don't have a spell icon, thus everything stacks with them.
			
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As far as I'm aware, it should remain in this state through the life of the server.  These comments about it are in October 2001.  The first comments of 30 MR and no effect are in 2003.  That isn't to say it happened earlier, but I couldn't pin down the exact date.
Praise full immersion.