Extra Content

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Extra Content is a keyword that represents content and league mechanics from previous challenge leagues that can be encountered randomly in Maps, a few of which are also encounterable in the Acts.

By default, most sources of Extra Content appear at a base chance of approximately 8% in maps. Older mechanics may have different spawn chance calculations which have never been officially published in patch notes. This chance can be increased by various Notables and small passives on the Atlas Passive Skill Tree, or reduced to 0% through various Notables. Things that modify the rate of Extra Content do not prevent it from being spawned via guaranteed encounters e.g. Scarabs.

The Stream of Consciousness Keystone multiplies the base chance by 1.5x. In the case of mechanics with a 8% base chance, this is the same as +4% additional chance to encounter that mechanic. Note that this keystone does not affect sources of Your Maps have +#% chance to contain <league mechanic> or Your Maps have +2% chance to contain other Extra Content from the Atlas tree.

Currently, Extra Content includes the following:

Extra content spawn chance

Mechanic	League	Base spawn chance
Abysses	Abyss league	8%
Breaches	Breach league	8%
Blights	Blight league	8%
Expedition Encounters	Expedition league	8%
Legion Encounters	Legion league	8%
Ultimatum Encounters	Ultimatum league	~8%
Mirrors of Delirium	Delirium league	8%
Monsters Imprisoned by Essences	Essence league	Unknown
Ritual Altars	Ritual league	8%
Rogue exiles	Anarchy league	Unknown
The Sacred Grove	Harvest league	8%
Shrines	Domination league	Unknown
Smuggler's Caches	Heist league	Unknown
Strongboxes	Ambush league	24%
Tormented Spirits	Torment league	Unknown

Note that content from Masters (Bestiary, Delve, Incursion, Betrayal) and other previous league mechanics (e.g. Beyond, Invasion, Rampage, Talisman, Harbinger, Warbands, Tempest, Synthesis unique maps, Ultimatum's boss) are not considered Extra Content. Other former league mechanics that were part of the core game but were subsequently removed (e.g. Prophecy, Nemesis, Bloodlines, Archnemesis, and Perandus) are not considered "Extra Content" as well.

Version history

Version	Changes
3.23.0	Ultimatum has been added to the core game, replacing Metamorph. You will have approximately an 8% chance to find the Trialmaster and his Trials of Chaos in Maps. Metamorph has been removed from the core game.
3.18.0	The chance for Map Areas to contain a Mirror of Delirium no longer increases by a small amount for each other league, atlas or master mechanic that appears in that area. Instead, Map Areas now have an 8% chance to contain a Mirror of Delirium, with campaign areas from the Torched Courts onwards having a slightly higher chance. Added a new Atlas Keystone Passive Skill, Stream of Consciousness, which grants "Your Maps cannot be modified by Fragments" and "Your Maps have 50% more Base chance to contain Extra Content". "Extra Content" as a keyword is introduced (see: Stream of Consciousness)
3.14.0	Increased the chance for Map Areas to contain The Sacred Grove by 60%. The chance to encounter a Zana mission requiring you to complete a Harvest encounter has also been increased by the same amount. Reduced the chance for Map Areas to contain Abyss, Ambush, Blight, Breach, Domination, Essence, Heist, Legion, Metamorph and Torment encounters by 20%. The chance to encounter a Zana mission containing any of these mechanics has also been lowered by the same amount. Reduced the chance for Map Areas to contain a Delirium Mirror by approximately 20%. The chance to encounter a Zana mission containing a Delirium encounter has also been lowered by the same amount.
1.0.0	Rogue Exiles will start to spawn in all leagues (including Race events) at around 60% of the rate that they appear in Anarchy.