Special Ability
Action Point System
Dio’s Action Bar
Unlike every other character, every Demon character (Dio, Zero, Ley, Rufus, and Veigas) have a function called “Action Point” (sometimes called “Ability Power” and abbreviated as AP) that masks over skills and some regular attacks; basically replacing Mana Points. Utilizing the Skill Tree, AP characters are capable of using up to five different abilities, whether it be lethal skills or simple techniques. Unlike MP, an AP character’s skills and techniques are activated through the press of a button, rather than charging up to use a skill.
On the bottom center of the screen, the five skills will light up. This means that they are ready for use. The command interface with AP uses 
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Unlike other characters, AP characters do not gain the newfound energy by hitting enemies, but rather, waiting out. However, since it is still technically Mana-based, it will absorb Mana fluids from potions, items, and armor properties.
If an AP character receives a Counterattack, however, all the abilities are given a maximum 10 second cooldown. This can be reduced by a few seconds via Reduced Counterattack Cooldown Time, though not all AP characters possess this.
Rin, Asin, Lime, and Edel use the hybrid Action-Mana Point System. They have an MP bar instead of an AP bar and can use their skills by charging, but can also have up to five abilities which can include techniques.
Job Stacking
As Dio, Zero, Ley, Rufus, Rin, Asin, Lime, Edel, and Veigas advances more and more, they grow stronger and more lethal. However, they are unable to revert back to previous jobs, as all of them technically are as one. As demons absorb more power, they can use later job abilities and yet retain their previous ones as well.
According to the profiles of Drakar and Leviathan, it says that Dio sealed most of his powers, thus eventually restoring them in the future. This explains how and why he can “job stack”.
Dio’s Rake Hand notably transforms as he gets his strength boosts.
Grandchase 
