Amass Anger

Overview
Amass Anger is an unlockable starting card for the Knight class. It is the overcharge protection card for the Knight and lets you overcharge once without penalty. This is very useful for making risky plays in sticky situations, and is a long term card since its effect is not on a timer. So playing it will hardly ever cause it to go to waste, as it will allow you to confidently make risky plays for the whole battle until you overcharge once, which will remove its effect and grant you a damage bonus.

The damage bonus is pretty good and very high at high levels, so overcharging on purpose to gain a damage bonus is not a bad strategy if you're sure that it will put you into a winning position. There are however better cards to spend your upgrades on, and Amass Anger is better used for overcharge protection than for damage bonus.

This card is upgradeable and increases the damage bonus granted on each upgrade.

Amass Anger cannot be found during runs by any class, but can be passed to other classes by Knights after death.