Equipment Bugs
All bugs in this category are related to effects caused by equipment or equipment generation.
Stealth Effects
When using items that reduce a character's light radius, a character will only activate monsters who are in that light radius. However, the character's light radius for attracting monsters depends upon the highest light radius the character had on a level until he/she exits the level. If the light radius is increased/decreased while on the level, it will alter the player's light radius, but not in terms of monster attraction - they will be attracted to the highest radius that existed at any time on the character. In other words, always have stealth equipment equipped BEFORE entering a level, and if you drop a stealth item, you'll have to leave the level and come back to use its effect on monster attraction again.
When at full stealth level (-80% light radius), walls sometimes cannot be mapped even when the character is right next to them. Also, portions of the map for a level will appear as revealed very far away from the character's position. And, last of all, you won't see a monster one square away from you if it's at a diagonal angle. It won't see you, either.
High Durability Wraparound
When a character is saved with an item that has over 255 durability, its durability wraps around back to 1 to 10 durability. This can cause strange effects when using Hidden Shrines or finding items with durability-boosting suffixes that would normally cause its durability to be higher than 255.
If you use Hidden Shrines to take an item to exactly 255 durability, the item will transform to an indestructible item. This is because Blizzard used 255 in their code that checks whether an item is indestructible.
Items raised to 256 durability with Hidden Shrines have a number of problems. When starting a new game, the item will have zero maximum durability. Any attempt to repair the item at Griswold will then crash the game. Any attempt to repair the item with a warrior's Repair Skill (when it is something other than 0/0 durability) will result in the either the immediate disappearance of the item, or the item will become unselectable and will disappear when clicked on again.
Griswold's Repairs
Occasionally Griswold will charge you for repairing an item and yet not repair it, forcing you to have to pay for repairs again, and possibly multiple times.
GGriswold will not repair a cursed item because its value to him is negative or less than one.
Griswold can only repair an item when at least 1% of its durability has been lost; therefore, items over 100 durability can only be repaired after they've lost more than one durability point (over 200, 2 points).
Adria's Issues
Occasionally Adria will charge you for recharging a staff and yet not recharge it, forcing you to have to pay for recharge again, and possibly multiple times.
Adria will recharge a staff for free if the number of charges to be reset is less than 1% of the total number of charges on the staff.
If you sell an item at Adria and you don't have enough room for the cash to be placed in your inventory, the excess gold is lost.
Deadly Hunter
This unique bow is listed as doing +200% damage versus demons, just as the BloodSlayer (axe) and Civerb's Cudgel (mace). However, while the Civerb's Cudgel and Bloodslayer have the effect of tripling a characters total damage to demons (not the weapon damage, but the total), the Deadly Hunter does not. This is caused by the way the game engine handles arrows differently than melee weapons.
Impossible Items
Due to the item generation rules of Diablo, these unique items cannot be found: Bramble, Crackrust, Lightforge, The Deflector, Gonnagal's Dirk, and The Mangler.
King’s vs. Champion’s Prefix
The prefix "Champion's," while being weaker than "King's," is considered more valuable in terms of rarity in the game. This causes "Champion's" to be unfindable from any monster; it can only be bought from Wirt. This is a result of a hasty change in the value of the "King's" prefix before the release of the game - it was lowered to make it easier to obtain, and "Champion's" was not.
Swing Speed
The suffix "of Haste" is supposed to be faster than "of Speed," but they both produce the same swing speed as they eliminate the same number of animation frames on an attack. Blizzard incorrectly claims this was fixed in the 1.07 patch.
The suffix "of readiness" (designed to drop one frame of animation) is useless.
Death With Cursed Items
When dying from monsters' attacks, a character loses all items. If he/she was carrying items that lower hitpoints, he/she will regain the hitpoints that were drained by those (either cursed items or certain uniques). Upon dropping the items, the player will sometimes reach a value of hit points greater than zero - but the character will remain dead on his/her screen. For other players in the game this character has positive hitpoints, though, and thus they will not see a corpse and thus be unable to cast resurrect on him/her.
Sharp Prefix
The prefix "Sharp" is considered a cursed prefix by the game (it shouldn't be), so you can't buy it in town.
Cursed AC Rounding
When a cursed prefix or suffix modifies the AC value of an item, it is supposed to lower the AC. However, if the amount of AC to be lowered rounds down to zero, the AC is actually raised by 1. For example, an AC 3 helm with -26% AC will yield an AC of 4, since 26% of 3 is rounded to 1.
"Red" Items
"Red" items (i.e. items that you are "wearing" but cannot use because you don't meet the requirements), put on your character by using an item that gave you the requirements, equipping it, and then removing the item that allowed you to use it, will lose durability just like items you're allowed to use.
Even though a red item cannot be used by your character, it will still modify your damage based on weapon type. If you use a "red" sword, for instance, your fist damage will be raised by 1.5 times when you punch animals, and lowered by 0.5 times when you punch undead.
Griswold/Wirt Pricing Inconsistency
If you buy an item from Wirt and then go to sell it to Griswold, he will offer you one fourth of the price you paid Wirt for it. If you then start a new game, however, Griswold will only offer you one fourth of what HE would sell it for (less money).
Corruption Suffix
Equipping an item "of Corruption" when you have negative mana will actually GIVE you mana, setting your mana to zero.
If you equip an item of corruption and afterwards equip mana adding items, mana will still be added. Also, when you take off the corruption item and re-equip it, mana will not be reset to 0, but instead to what it previously was (i.e., mana from items equipped after equipping the corruption item will still be added).
More seriously, if your character has negative max mana (possible with mana-reducing items such as the Cranium Basher), using an item of Corruption will set your mana to zero. Removing it keeps your current mana at zero (of a max of a negative number). If you then unequip the item(s) which gave you negative max mana, the game will immediately crash. Don't try this at home.
Gold Image Stability
Images of gold piles are updated incorrectly sometimes. For instance, if you have two piles of gold totaling between 5,000 and 10,000 gold, you can merge one gold pile with the other and the amounts will switch. If this causes one pile to obtain a "smaller" shape, drop it on the ground and pick it back up - it will have the older image of a larger pile again.
Unfindable Items in Dungeons
Monsters in each level of difficulty have the same value for item drops in terms of prefixes and suffixes; therefore, many high-end prefixes and suffixes can never be dropped by a monster. Specifically, these prefixes and suffixes cannot be found on items dropped by monsters:
Mammoth, Whale, Holy, Godly, Weird, Strange, Champion’s, Ruthless, Merciless, Carnage, Slaughter, Osmosis, Burning i Thunder. Only Wirt can sell you these prefixes and suffixes. Hydra's and Wyrm's enchantments cannot be generated in town or in dungeon.
Fire/Lightning Suffix Issues
Damage from Fire or Lightning elemental arrows will occasionally be highly excessive. It is caused by the calculation for the damage occurring multiple times as it hits its target. This occurs on traps sometimes, as well.
When a monster is hit by a fire damage arrow, it stops regenerating hit points. This even applies to the Dark Lord, Diablo.