Power Surge

Overview
Power Surge is a card that can be found by Knights while levelling up. It is an extremely strong card and can single-handedly win battles against very strong opponents. Upgrade it to level 3, use it on a full EP pool and just gain a ridiculous amount of strikes. There's not much else involved in using this card, just make sure that you have a high EP cap and don't overcharge after using it.

This card is upgradeable and reduces the amount of EP required per strike on each upgrade.

Power Surge can only be found by Knights in a run while levelling up, but it is not guaranteed. It can also be passed to other classes by Knights.