This refinement is used on bone type armor. It raises resist caps while lowering defense chance cap. Bone armor is one of the special types that raises the cap on LMC +3 per piece you wear (non medable).

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Ultima Online Bone Thread of Invulnerability
Category: Armor Refinements
$6.99
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About Bone Thread of Invulnerability
Bone Thread of Invulnerability Game Information
Item Type:item
Spawn Location:Shop boxes, spawn bosses, pirates
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