Apart from the data given in earlier chapters, monsters have other properties that are often shared within a monster type. This chapter will list such properties, which might be of interest in various ways. Currently the information includes monster size and how it affects selection of monsters for a specific dungeon level, attack types (for information in more detail about the behavior of the monsters according to attack type, see chapter 5.5), intelligence factor, abilities to open doors and follow target around corners, and timing information.

Each monster type has a size associated with it. That size is used when selecting monsters for a specific level of the dungeon. Maximum total size of all monsters types on a level is 4000. Most monsters in the church, for example, have small sizes, and that is the reason why you will see many different monsters on each level. Monsters in hell and the Crypt normally have large sizes and thus you will only see two or three different monster types at once. In the tables below you can find the size of all monster types in the game. Note that golems also have a size, which is important for monster selection (see below).

The process of selecting monsters for a dungeon level is as follows:

1. Subtract the golem's size from the total size as it can always exist on every level.
2. If there are any special quest monsters on a dungeon level (like Snotspill, The Butcher, Lachdanan, Hork Demon and so on) subtract the size of that monster type. That monster type will also appear, if possible, on that dungeon level of course.
3. In Hellfire, if the dungeon level is level 2 or 3 of the Hive, subtract the size of the Hork Spawn. That monster type will also appear on those dungeon levels of course.
4. In Hellfire, if the dungeon level is level 4 of the Crypt, subtract the size of the Arch Lich. That monster type will also appear on that dungeon level of course.
5. In multi player, if it is the same dungeon level as the Skeleton King appears on (dlvl 3), pick a random skeleton type that can appear on that dungeon level. Subtract its size. It can now appear on that dungeon level and will be the skeleton type that appears around the Skeleton King.
6. If possible, pick a random monster type of the ones that has not yet been picked that can appear on the dungeon level in question, and whose size is equal or less than the size left. Subtract that monsters size; it can now appear on the level.
7. If there are still monsters that have a size less than the size left, go to step 6. Otherwise, end monster type selection.
8. If any monster type that was picked has a unique monster set to appear on the dlvl in question, that unique monster will always appear.

All special mini levels found in single player are created by special code and thus are not created according to the above. The same is true for dlvl 16. Which is also created by special code and does not follow the above steps. In the same way, the monsters in Arch-Bishop Lazarus' room on dlvl 15 in multi player are not counted toward the size limit. They are considered when the game picks possible unique monsters for the dungeon level, though. That is the reason you will always see Bloodlust on dlvl 15 in multi player.

With the algorithm above and the monster size also from the tables above, it is quite easy to calculate the probability of a specific monster appearing on a dlvl. The table below has been calculated using the above information. For information about on what dlvl monsters can occur, see chapter 5.2.1 and 5.2.3.

Most monster types have their own unique way of attacking and moving. However, some of the monster types share some common attack types. The table below lists the various attack types that exist. I have used the name of the first monster type that uses that attack type. For example, skeletons and knights use the same attack type, but I have called it skeleton because they appear first. All monsters of a monster type share the same attack type, so I have only listed attack types for monster types. Since Hellfire does not have monster types, I have listed the attack type for each monster.

When a unique monster is present, it and its mob may have a different attack type than the normal one for that monster type. See chapter 5.4 for information about such attack type changes.

The attack type does not only affect the actual attack but also how the monsters move around. Many monsters that share a specific attack type still cast different spells as the attack type does not in itself include spell (or arrow) cast. For information about what spell specific monsters cast, see 4.2. Others may be similar at some parts; for example, at a distance greater than Inferno range (3 squares) a Balrog will behave like a Skeleton in its movements, and it is not until it gets closer that it will start to circle the player. There are many similar features between the different attack types. Most of them are also heavily triggered by the distance to the target; that is, the behavior of the monster changes as it gets to a specific distance(s) to the target. Monsters can also gain a different attack type if they are part of a mob of a unique monster with a different attack type. The way monsters behave is not affected by difficulty level. For a more detailed explanation of how the attack types work, see chapter 5.5.

It is worth noticing that within a certain monster type the various monsters normally have an increasing "intelligence". A good way to see this difference is the look the various Goat Archers. Run up to them and you will see that a normal Flesh Clan Archer will not run a way immediately while a Night Clan Archer will normally run away before you even get close. Similar differences can be seen for most monster types. The table below will list the intelligence factor (Intf) within each monster type. It is basically a number between 0 and 3 (inclusive). The higher the number, the higher the intelligence of the monster. For monster types with 4 subtypes in Diablo, I have listed the four values after each other. For monsters that have no subtypes, there is only one number. Otherwise, there is no value given. For information about what intelligence factor unique monsters have, see chapter 5.4.

Presented in the table below is also the ability to open doors and to follow characters around walls. If a character disappears from the line of visibility of a player, they will normally move to the last position where they saw the character. Some monsters have the improved ability to also find the way around obstacles and follow you even further. This makes it possible for them to even follow you around a wall should you just teleport to the other side of it. If they do not have that ability, they will normally end up where you teleported from. These abilities are also presented below in the same way as the intelligence factor. A D means the monster can open doors and an F that means they will follow you.

This chapter deals with the time it takes for different monsters to do different things. The data given is explained below. In almost every case the data is the same for each monster type and thus is not given for each subtype (as it is the same). Note that for all the actions below, the time is only valid for the case when the monsters are actually walking, swinging and so on. Most monsters will, for example, make pauses occasionally when they walk, so that the average walking speed over a longer time is slower. The same applies for when monsters attack players. Sometimes they make pauses. Even monsters within a monster type may act differently as, for example, the duration of a pause is generally affected by the intelligence factor. The data below does not take such things into consideration. However, the actual time to do an action does not vary between different difficulty levels and subtypes of monsters. All times are given in seconds.