Library

A Library is where Research is produced to learn technologies.

The research rate is determined by a combination of 8 things:

The number of Warlocks or Liches currently researching.
The level of the research workers researching (higher level research workers produce more research)
The number of Library Tiles: each tile increases the research rate by 0.5%.
The number of Bookcases, Sturdy Bookcases, and Ornate Bookcases in the Library.
The Efficiency of a Warlock or Lich: efficiency can be improved by shocking.
The presence of a Taskmaster (+2% research rate per Taskmaster level).
Purchasing the +25% research rate from the Store.
Total Research per Hour caps at 12000 per Dungeon.

A library can only have a certain amount of warlocks researching in it per library level:

A level 1 library can only hold 1 research worker
A level 2 library holds 2 research workers
A level 3 library holds 3 research workers
A level 4 library holds 5 research workers
A level 5 library holds 8 research workers

IMPORTANT NOTE: As of the June 14, 2012 update if there are more Warlocks available than the library can support, the rate of Research is based upon the average level of the highest level warlocks available. Previously the rate was calculated using the lowest level warlocks.

NOTE: Both Liches and Warlocks produce research, but do so at the same amount. As Liches are much more expensive than warlocks most players recommend treating research from a Lich as a bonus in a war based dungeon and not an end in itself.

Tile Cost: 50 Gold
Per Tile Bonus: 0.5% Research Rate

Level	Upgrade Requirements	Upgrade Time	Benefits	Accumulated Benefits
Level 1	N/A	N/A	Maximum Worker Bonus: 1 Research Worker	Maximum Worker Bonus: 1 Research Worker + Tile Bonus
Level 2	50 Gold 50 Crystal	5 minutes (claims .2 minutes)	Maximum Worker Bonus: 1 Research Worker Experience Production Rate: +2	Maximum Worker Bonus: 2 Research Worker + Tile Bonus Experience Production Rate: +2
Level 3	250 Gold 500 Iron 1 200 Crystal	2 hours	Maximum Worker Bonus: 1 Research Worker Experience Production Rate: +4	Maximum Worker Bonus: 3 Research Worker + Tile Bonus Experience Production Rate: +6
Level 4	4 000 Gold 200 Moonstone 20 Ashen Stone 80 Crystite	4 hours	Maximum Worker Bonus: 2 Research Worker Experience Production Rate: +16	Maximum Worker Bonus: 5 Research Workers + Tile Bonus Experience Production Rate: +22
Level 5	40 000 Gold 1 200 Moonstone 300 Diamond 200 Crystite 60 Prismatic Glass	8 hours	Maximum Worker Bonus: 3 Research Workers Experience production rate: +28	Maximum Worker Bonus: 8 Research Workers + Tile Bonus +Experience production rate: +50