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This article contains spoilers about Era content.
Every time you hit wave 100b, the era counter increases by 1. For example, if you are in era 5 and hit wave 100b, your era increases to 6.
There are several ways to combat the era enemies' shield and various powers, which most are found in Workshop-->Stairs
Here is a general overview of Era workshop. INCLUDES SPOILERS!(credit to @TECHTERROR731 on the discord)
In the first tab of the stairs, you will find various bars, 2 for each element to fill. In order to fill these bars, you must kill era enemies of that element and get hit by them (You must take at least 0.1 damage to count as a hit) during tower testing. Once a bar is filled for an element, you can reveal it to find out one of the element's era powers. When both bars are revealed for one element, that element may now be disabled and will appear in tab 2 and unlock tab 2 if you haven't already done so. You may need to reach era in different regions if you want to reveal all the elements.
In the second tab of the stairs, you will find many bars and buttons. At the top, you will see your era dividers. These divide the era shield of era enemies so it is easier to destroy and survive them. You can increase your dividers by pressing the two buttons beside each icon. Under your era dividers you will find a variety of bars and buttons. These let you decrease the cost to disable the powers of each element. The two buttons over the bar will let you speed up the process, at the cost of some hits taken and enemies destroyed.
In the final tab of the stairs, there is a bar and many tabs. The bar will let you decrease the cost to temporarily increase your dividers while in a round of the tower testing. You can also speed up the process by using gems once you get the Chained Mannequin or you can speed up it with the power plant once you get the Ominous Coil artifact. Under the bar there are many tabs. These let you gain elemental essence which can unlock modules to the right of the bar. Once you get to Military Tier 9, elemental essence will also give you a damage boost for each essence you have.
Every enemy has certain powers based on the element it has. These powers can be disabled by using the new Era tab during Tower Testing, at the cost of Tower Testing XP.
The formula for the XP cost of disables is
base_cost * (100 + 0.9 * base_cost)disables, where
base_cost is the initial cost (starts at 1000, but can be reduced in Tab 2), and
disables is the number of already-disabled powers.
Note that the costs of already-disabled powers don't matter, so it can help to save your lowest-cost disable for last.
The enemy powers are as follows: