how do i make a skill that fills up with energy

[tender sapphire]

basically,when you attack you get energy and it fills up the gauge of an ult

also an another question: if i make a gacha do the percents need to add up to 100?

[hybrid terrace]

Okay so you need a custom component, it doesn't matter the name the only thing necessary is that it has a number attribute.
Now on the weapon(or hitbox) when it hits a target, sets the attribute + 1(ex: On "cool comp", attribute "energy" set energy + 1)

And from that you are practically done

[hybrid terrace]

Just set an limit that when the player presses the skill, it checks if it is on the needed number(example like in the third image: if Energy ≥ 100 then skill script)

Not accurate to the images, but I hope they are understandable enough lol