The Well is a building, that gives a number of random material each turn. Only unlocked materials may be obtained this way. Bonuses from multiple wells don't stack.
Researching the well requires 1 advancement point.
Good results may be obtained by building good quality well and rushing to unlock some rare material early in the game. Later you should consider demolishing the well to free space for more useful buildings, as the output becomes unreliable due to the number of unlocked materials.
Base recipe Edit
Combinations are sorted by Primary attributes|Total attract bonus from secondary attributes|Research points. All combinations may also be found in this spreadsheet.
Maximum attract bonuses Edit
|Attribute||Primary Material||Secondary Material|
|Attract Goblin +2||Any|
|Attract Human +2||Any|