Please consider implementing a "meter" or indicator of some sort to let the player know what level their ability is currently at.

Raging Strike, Berserk, Rampage, and Power Surge all have higher "power levels" that effect the potency of the ability. If these abilities can each stack up to 3 times, then simply putting a 0, 1, 2, or 3 next to the icon would be sufficient.

Thank you for your consideration.