Abilities, also known as skills, are power-ups that can be obtained in the midst of each adventure, and reset upon the end of the adventure. These abilities strengthen the player's character in various ways through the adventure, allowing players to better deal with the increasing difficulty as they progress through the stages. At any point, the list of abilities possessed by the character is accessible by pausing the game.
Players are given a choice between three abilities each time their character levels up, as well as at the start of the adventure if in possession of the Glory talent . At the end of a Boss fight, a Lucky Wheel will appear, giving the player a chance to obtain either a abilities, a heal or some coins. Abilities can also be obtained from Angels, and The Devil (guaranteed to show up if the player takes no damage during a boss fight in place of the Lucky Wheel).
On the other hand, The Devil will give an ability in exchange for some of the character's maximum health. Some abilities, however, are unique to The Devil, such as passing through walls, walking on water, or perhaps most notably, an extra life.
It should be noted that any ability that gives the players extra arrows, reduces the damage of each individual arrow fired. For example, Front Arrow +1 adds an extra arrow being fired forward, but the arrows do slightly less damage, but the overall damage is increased.
Some of the abilities have special elemental effects, which can be:
Lightning - When an enemy is hit, electricity bolts strike all enemies that are nearby.
Ice - The first time an enemy is hit, it freezes for a short time. Each enemy has a short cooldown until he can be affected again (around 2s). Hitting the enemy again unfreezes him before the effect ends. Some bosses are immune to it.
Poison - When an enemy is hit, he is poisoned and starts losing HP slowly (ticks/s ~= 2s). The effect remains until the enemy dies.
Fire - When an enemy is hit, he starts burning and losing HP fast (ticks/s ~= 0.25s). However, the effect only lasts for approximately 2s, unless the enemy is hit with fire damage again. (Not sure if other effects stop the burning, or if some bosses put out the fire faster than normal mobs. Each tick deals half the damage of a poison tick. This needs to be checked).
All these elemental effects stack up so you don't have to worry about not getting any elements (e.g. Fire and Ice).