- Unique monsters that always spawn in the same location with the same Unique bonuses.
- Additional Unique bonus is randomly selected in Nightmare, and two additional Unique bonuses are selected in Hell.
- Ignore Target's Defense only applies to minions.
- -% Target Defense is only 50% effective, but still 100% effective against minions.
- Freeze length chills instead; only minions can be frozen.
- Stun length only has 10% chance of being applied, but suffers no other penalty.
- Effects altering AI cannot be applied directly, but can affect minions.
- Life lost to Crushing Blow is halved (so 1/8 of current base life when applied by a melee attack and 1/16 when applied by a ranged attack).
- Do not regenerate damage.
- Life drained by Open Wounds is halved.