LICH.ITM

This undroppable item is found on all lich's encountered in the Shadows of Amn and its purpose is to provide a lich with many of the lich-specific protections and immunities they naturally possess. Along with the RING95.ITM, these two undroppable items are combined together to give a lich the usual Undead protections afforded to almost all Undead, and also the unique lich protections.
This item gives general protection to non magical melee weapons via Opcode 120
The item gives the wearer immunity to spell and effects levels 1 through 5 via Opcode 102
The item bestows 100% cold and electricity damage resistance via Opcodes 28 and 29
Some specific spells are protected against using Opcode 206 (See info box)
Some specific status effects are protected against using Opcode 101 (See info box) - although, if RING.95 item is also worn by the creature, then there is actually some overlap between Ring (lich) and RING95.
Summoned/gated creatures classified as "summoned" and gender "demon" will ignore the item wearer via Opcode 100 (does not affect Deva or Planetar) 
There are several Opcodes that can be configured by the game engine to inflict "Instant Death", "Kill Target", "Vorpal" or a "Slay" effect. These are Opcodes 13, 55, 209 and 238 (Disintegrate). This item protects against all of these instant death effects, except for Opcode 13. Opcode 13 is applied (via Opcode 177) by several Undead Killing items in the game, such as the Mace of Disruption, Azuredge and Runehammer.
==Mod content==
The Sword Coast Stratagems mod makes changes to this item. It rearranges some immunities to allow SCS methodology to allow Breach to affect a Lich. It also adds numerous Opcode 328 Set Extended or Spell State identifiers for improved use by game scripts. It also adds many individual Opcode 206 Protection from Spell entries for better implementation of the Lich's innate spell level immunity. Further, it makes changes to account for and improve compatibility with certain other modifications.