An ability is a skill possessed by a unit. As the player, you activate abilities during your warrior's turn.
Ability selection is the way you can customize how your warrior plays.
Learning new abilities
When you first start, your warrior will only have a few abilities. Additional abilities are acquired progressing through the tower. With each level, you'll learn new things or find artifacts that will expand your capabilities.
There are two types of abilities: actions and senses.
An action is an ability that affects the game in some way. Is through actions that you're able to inflict damage, protect yourself or other units, and interact with your environment.
Only one action can be performed per turn, so choose wisely.
A sense, on the contrary, doesn't affect the game but gathers information about the floor. You can perform senses as often as you want per turn to collect information about your surroundings and to aid you in choosing the best action according to the circumstances.
Since what you sense will change each turn, you may want to record the information you gather for use on the next turn. For example, you can determine if you are being attacked if your health has gone down since the last turn.