NOTE: there is something wrong with this analysis. In a test, a blessed girdle of giant strength was destroyed in the ToEF despite intrinsic resistance, intrinsic immunity, and the ring of immunity. Something is missing here and requires investigation.
|Situation||Success%||Equipment longevity increase|
|1 cursed ring||50.00||2.0|
|1 uncursed ring||80.00||5.0|
|1 blessed ring||98.00||50.0|
|2 blessed rings||99.00||100.0|
|1 uncursed ring, lucky + fate smiles + crowned + ankh||89.50||9.5|
|1 blessed ring, lucky + fate smiles||98.89||90.0|
|1 blessed ring, cursed and doomed||86.00||7.1|
|1 blessed ring, wearing CoS||93.50||15.4|
|2 uncursed rings, cursed and doomed||99.00||100.0|
If you are carrying at least one waterproof blanket, regardless of B/U/C, water will not affect your inventory. There is no blanket damage possibility.
If you are carrying at least one fireproof blanket, regardless of B/U/C, fire will not affect your inventory. However, there is a chance to lose one blanket when using them in this way. The best blanket you are carrying by B/U/C is always the one evaluated for damage. Destruction occurs if 1d1000 <= (5, 15, or 100 by blanket B/U/C) + (GoodLuck + BadLuck) * 10. Note that a blanket will protect your inventory even on the turn it is destroyed.
|Blessed, lucky + fate smiles + crowned + ankh||4000.00|
|Uncursed, lucky + fate smiles + cursed + doomed||(infinite)|
|Blessed, lucky + fate smiles + crowned + CoS||52800.00|
Item damage immunity
Artifacts cannot be damaged by any element.
If the base destruction chance for the material and element (see below) is 0%, the item cannot be damaged regardless of any positive modifiers.
Rustproofed and naturally rustproof items cannot be affected by water.
Any item granting resistance to fire cannot be affected by fire. Items granting only immunity, including the iron crown of fire and ring of elemental mastery, are not so protected.
Any item granting resistance to shock cannot be affected by electricity. Items granting only immunity, including the iron crown of lightning and ring of elemental mastery, are not so protected.
Any item granting resistance to acid cannot be affected by acid. Items granting only immunity, including the black dragon scale mail (which is made of adamantium) (!), are not so protected.
Any item granting resistance to fire cannot be affected by cold. However, this has no effect, as all such items are metal or artifacts.
Item damage resistance
Items which are not immune have a base chance of destruction or damage depending only on the item's material and the element in question. This chance is reduced by 20% (rounding down) if the item is blessed. It is then increased by 50% if the item is rusty and twice your Luck is subtracted. Finally, the chance is divided by your resistance factor (see above) (rounding down) and rolled. Thick gauntlets automatically resist damage 75% of the time.
If a stack of items is targeted, from 1 to the entire stack (uniformly distributed) will be destroyed. If more items would be destroyed than remain in the maximum destruction limit, destruction is simply capped; this is why losing 2 gold pieces is so common in the ToEF.
Causes of damage
Use of cursed climbing sets causes crushing damage, maximum damage/5 (min 1) items.
Swimming has a 50% chance of causing water damage, maximum 1000 items.
Falling into the Rift causes crushing damage, maximum 40 items, once per unsuccessful climb check.
Monsters breathing at you can cause item damage; parameters need investigation.
Exploding spellbooks (a possible side effect of reading failure) cause fire damage, maximum 1000 items.
Hitting oneself with bolts can cause item damage; parameters need investigation.
Exploding doors can cause item damage; parameters need investigation.
Water traps cause water damage, max 1000 items.
Acid traps cause acid damage, max damage/5 (min 1) items.
Ceiling traps cause crushing damage, max DL items.
Water orb insertion causes water damage; parameters need investigation.
Slipping and falling into a pool causes water damage; max 1000 items.
Gushes of water from frog quest failure causes water damage; max 1000 items.
Offensive alchemy causes fire damage; max (damage / 5) (min 1) items.
The ToEF causes fire damage every turn; maximum 2 items.
Air Temple background damage causes electricity damage; maximum (damage / 5) (min 1) items.
Drenching rain causes water damage; maximum 1 item.
As mentioned above, artifacts, any item kept behind a blanket, and any item kept in an even inventory slot is always safe. Otherwise, it depends on material. Some items with low destruction chances can be made to round to 0; these items are safe only if you are not cursed or doomed.
Under fire threats such as red dragon vaults and the Tower of Eternal Flames, only higher metal and crystal items are unconditionally safe. Stone items are safe if blessed and you have any fire resistance, or if you have two fire resistance / intrinsic. Iron items are safe if blessed at two fire resistance sources; uncursed iron items are safe in the ToEF if you have enough fire protection to avoid damage. Blessed leather items can be made safe with three immunity sources, or two immunities and two resistances.
Water only damages paper and iron. Even they can be safely carried if a waterproof blanket is available.
Under crushing threats such as the Rift and trick doors, unconditionally safe materials are leather, cloth, gold, eternium, and crystal. Adamantium and mithril items are safe if blessed.
Exploding runes threaten all items except adamantium, eternium, and crystal. Mithril items are safe if blessed.
In electrical situations such as the Air Temple and Blue Dragon Caves, metal and crystal items are unconditionally safe. Stone items are safe if you have immunity or triple resistance; blessed leather items are safe with double immunity and double resistance.
Against acid, only stone, glass, crystal, and eternium are unconditionally safe. Adamantium is safe if blessed.
Cold only threatens glass, paper, and stone. Stone is safe if blessed.