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 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 additional chances to encounter mechanics.

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%
Metamorph Encounters	Metamorph 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	Unknown
Shrines	Domination league	Unknown
Smuggler's Caches	Heist league	Unknown
Strongboxes	Ambush league	Unknown
Tormented Spirits	Torment league	Unknown

Note that content from Masters (Bestiary, Delve, Incursion, Betrayal; Kirac cannot be encountered in map) are not considered Extra Content. There are some league mechanics that are not part of masters or Extra Content, such as Beyond, Invasion, Rampage, Talisman, Harbinger and Warband etc, but available to spawn in the game, by some mean.

There are other former league mechanics that are part of the core game but subsequently removed: Prophecy, Nemesis, Bloodlines and Perandus (as the form of The Perandus ManorThe Perandus Manor
Chateau MapMap Level: 72
Map Tier: 5
Guild Character: ™
Item Quantity: +(60-100)%
Item Rarity: +(200-300)%(100-150)% increased Experience gain
(200-300)% increased number of Rare Monsters
(30-40)% more Monster Life
(16-24)% increased Monster Damage
Area contains Cadiro PerandusForget kings and emperors;
He who holds the coin holds all the power.Travel to this Map by using it in a personal Map Device. Maps can only be used once. unique map). These are not "Extra Content" as well.

Version history

Version	Changes
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".
Unknown	"Extra Content" as a keyword is introduced
3.14.0	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 exile became the first league mechanic that incorporated into the core game.