Regular monsters sometimes appear with one of these properties, presumably as part of their base stats. [[Molten]] skeletons, for instance, appear to replace the "Burning Dead" skeletons seen in past Diablo games.

* {{iw|Monster_modifier#Unique_Monster_Bonuses Diablo II Boss Modifiers}}.

This boss modifier was first seen at the start of the Diablo 3 Beta test, where it was instantly the most dangerous property in the game. That initial version, which let the bosses and their minions, as well as Champions, summon multiple an Arcane damage [[Hydra]] (just one head, unlike the triple headed version of the Wizard skill), was very dangerous as the dragon head fired a rapid stream of Arcane energy balls. The effect was nerfed in the v5 Beta patch, and changed to the current "spinning second hand" style, which is much less dangerous. This was an unpopular change with fans, and it's often hoped the first Hydra head version will return in the full game, perhaps on higher difficulty levels.

[[Ballista]] was a new property seen in the Blizzcon 2010 demo. This modifier appeared to increase the size and damage of their projectiles, but the damage wasn't noticeably giant, and the shots didn't explode upon impact, as Warcraft 2 fans might have expected, given the utility of the human catapult, the Ballista, in that title.

[[Cold Aura]] reported by a fan from the Blizzcon 2009 demo. It has not been seen since, and is considered unconfirmed. It reputedly worked just as it did in Diablo 2, chilling and slowing players within the radius of effect. Interestingly, it was not until after that year's Blizzcon that [[Jay Wilson]] let it be known that [[Auras]] would return to the game, most likely as [[Monk skills]].

Their sparking properties were first observed with awe in the Blizzcon 2009 and 2010 PvM demos, where the sheer amount of blueish sparks they spit out (whether being hit or not) made them seem like miniature arc reactors. Unlike their Diablo II version (Lightning Enchanted) the sparks no longer spit out in just four directions, like a "+" sign. They now travel in every direction, jittering wildly across the screen.

===Fast===

When Frozen [[bosses]] and [[Champions]] (but not minions, as of the Diablo 3 Beta) die, they explode in a [[Frost Nova]] that will briefly freeze players it strikes.

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===Jailer===

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===Knockback===

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[[Magical]]. This modifier was seen several times during Blizzcon 2009 play testing, but its effect wasn't apparent to any of the players.

===Mirrored===

Individual bosses are able to produce numerous clones at the same time, potentially making their own minion packs. Actual minions can not create Mirrors, though a Champion pack with Mirrored can turn into quite an ordeal.

[[File:Boss-molten-unburied2.jpg|thumb|300px|A Molten [[unburied]].]]

The theory of this modifier (it was revealed during the Gameplay panel at Blizzcon 2011) is to make Mortar bosses more dangerous to ranged attackers, while melee combatants can stand in close where the mortars will fly out over their heads. In practice, melee fighters take several hits from the boss as they close in, while a ranged attacker who stays well back will hardly be hit at all.

===Multishot===

The real danger of MS in Diablo II was due to a bug; since the MS stacked on top of the sparks that Lightning-Enchanted bosses emitted, creating insta-kill fields of lightning. That [[MSLE]] bug was fixed in v1.10, and MSLE bosses have not been any special danger since then. Though that same bug will surely not return in Diablo III, the developers might give MS some stacking ability with [[Electrified]], [[Mortar]], [[Ballista]], or other ranged boss modifiers to up their danger level on higher difficulty levels.

===Mythical===

[[Mythical]] was seen several times during Blizzcon 2009 play testing, but its effect wasn't apparent to any of the players.

===Nightmarish===

It's dangerous since you can't pick them off one at a time, and you can't kill one quickly to lessen the damage they're dealing. All of the monsters stay on the attack until they're nearly dead, at which point they de-link and usually drop over one right after the other. That aspect of it is a fun mod, since the whole group goes over like dominoes once one of them succumbs.

This mod seems to be the Diablo 3 version of "Poison Enchanted."

===Powerful===

[[Powerful]] was seen in the Blizzcon 2010 demo, but not understood completely. It sounds like the Diablo III version of "Extra Strong," a Diablo II mod that granted bonus damage to monsters, but that wasn't clear from the play testing. Nor did these bosses seem to have any specially greater amount of hit points.

[[Stoneskin]] returns from Diablo II, once again granting monsters much higher defense. It doesn't seem to improve the monster's hit points or resistances though, as [[Wizard]]s found monsters with this one easy prey.

===Teleporting===

::A vampiric monster ruined my last playthrough of the con. I tried to hit it with my Witch Doctor, but it kept healing itself by hitting my mongrels. I spent something like 5 minutes gently kiting it around, trying to get off a Skull of Flame or two before it could melee me. I didn’t even get to level up that time. Very, very mad.

::--ExtraCrispy

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===Vortex===

[[Julian Love]] said that the graphics were still under construction and it would be improved in the final game. [http://diablo.incgamers.com/blog/comments/exclusive-blizzcon-interview-lead-technical-artist-julian-love/]

===Waller===

[[Champions]] can only create short, straight walls, while Bosses can create three-sided rectangles that box fleeing players in, forcing them to run back past the boss and other monsters to escape.

Doppleganger was the original name of the modifier now called [[Mirrored]]. See that entry for full details.