I asked a lot of people if they wanted an Illidan rework and they all said yes Illidan is my favorite hero in Warcraft and probably in all games, he was the reason I originally joined hots and I was so disappointed in his abilities so I think he needs a rework fast.
I had this idea to remove metamorphosis as an ult and make it into a passive quest to gain the meta ability you have to obtain 400-500 stacks (still not sure on the amount) to gain stacks you can basic attack enemies or attack them with abilities or be near a minion or enemy death also you can gain stacks from talents.
after gaining 400-500 stacks you can active D to turn into a demon increasing all damage by BLANK and increasing basic attacks by BLANK increasing speed by BLANK.
in level 20 there is a talent that makes it so the number of max stacks you can gain is increased by 200 and if completed you are now passively in your demonic from.