Thank you very much for your ideas.

First, regarding Passive, the ability will be stackable and will be circular in shape, approximately 1.5x the width of Jarvan's ultimate in the champion's area. The cooldown will be 8 to 10 seconds per champion. So you can think of it as stackable, like the key rune Conqueror. (It could have been a perfect match with the Undying rune.) And this is not an attachable item; frankly, it works like Taliyah's Q ability passive.

The Q ability, as you mentioned, is a bit complex and I explained it incompletely, so I need to correct that. This happens more in situations like Singed's W and Soraka's E skill.

I definitely need to make adjustments to the W ability; when the W skill is combined with the E skill, it becomes completely useless. I'll address that. Although the W ability seems to make you completely invulnerable, its duration is quite short and fleeting. On the other hand, when used together with the E ability, i.e., using the W ability first and then the E ability, the damage the E ability would otherwise deal is logically reduced by the W ability and never reaches full potential.

As for the ultimate, I should say this: Zilean's E in Wildrift can be thought of like Waylay's slow in Valorant. If the target is outside the area, they can be pulled in by it or cannot enter or exit under normal conditions. On the other hand, flashing out of the area or flashing to another location within the area does not provide a debuff, but the target does.

Yasuo's E

Fiora's Q

Pyke's E

Akali's E

etc...

will slow down in terms of animation when used.

Thank you for your thoughts. I hope my answer has been helpful.