Forbidden Knowledge
In Forbidden Knowledge you can do research in each of the three dark gods' domains. Every five research levels there is a soft cap, so you need to bring all researches to that level before you can research further. All upgrades are multiplicative.
Ocean secrets
To research the ocean secrets you need Ledra's tomes of power.
| Icon | Name | Increases | Cost | Effect per level |
|---|---|---|---|---|
|
Prestigious | Firestones earned after prestige |  1 tome of power
|
30% |
|
Guardian power | Damage of all guardians | 1 tome of power
|
82% |
|
Attribute health | Health of all heroes | 1 tome of power
|
35% |
|
Attribute armor | Armor of all heroes | 1 tome of power
|
35% |
|
Attribute damage | Damage of all heroes and guardians | 1 tome of power
|
35% |
|
Leadership | Main attributes of the leader | 1 tome of power
|
30% |
|
Team bonus | Main attributes of the non-leader heroes | 1 tome of power
|
30% |
|
Rage Heroes | Main attributes of all heroes using Rage | 1 tome of power
|
40% |
|
Mana Heroes | Main attributes of all heroes using Mana | 1 tome of power
|
40% |
|
Energy Heroes | Main attributes of all heroes using Energy | 1 tome of power
|
40% |
You can recruit Ledra with 50 of her tomes of power, when you have researched all ocean secrets to level 10.
Chaos teachings
To research the chaos teachings you need Yamanoth's tomes of power.
| Icon | Name | Increases | Cost | Effect per level |
|---|---|---|---|---|
|
Raining gold | Gold earnings |  1 tome of power
|
35% |
|
|
Guardian power | Damage of all guardians | 1 tome of power
|
82% |
|
|
Attribute health | Health of all heroes | 1 tome of power
|
35% |
|
|
Attribute armor | Armor of all heroes | 1 tome of power
|
35% |
|
Heroes' damage | Damage of all heroes | 1 tome of power
|
35% |
|
|
Leadership | Main attributes of the leader | 1 tome of power
|
30% |
|
|
Team bonus | Main attributes of the non-leader heroes | 1 tome of power
|
30% |
|
Fist fight | Main attributes of all melee heroes | 1 tome of power
|
40% |
|
Precision | Main attributes of all ranged heroes | 1 tome of power
|
40% |
|
Magic spells | Main attributes of all spellcaster heroes | 1 tome of power
|
40% |
Thunder chronicles
To research the thunder chronicles you need Kramatak's tomes of power.
| Icon | Name | Increases | Cost | Effect per level |
|---|---|---|---|---|
|
All main attributes | Main attributes of all heroes and guardians |  1 tome of power
|
40% |
|
|
Guardian power | Damage of all guardians | 1 tome of power
|
82% |
|
|
Attribute health | Health of all heroes | 1 tome of power
|
35% |
|
|
Attribute armor | Armor of all heroes | 1 tome of power
|
35% |
|
|
Heroes' damage | Damage of all heroes | 1 tome of power
|
35% |
|
|
Leadership | Main attributes of the leader | 1 tome of power
|
30% |
|
|
Team bonus | Main attributes of the non-leader heroes | 1 tome of power
|
30% |
|
Damage specialization | Main attributes of all damage heroes | 1 tome of power
|
40% |
|
Healer specialization | Main attributes of all healer heroes | 1 tome of power
|
40% |
|
Tank specialization | Main attributes of all tank heroes | 1 tome of power
|
40% |