@Riot The only thing holding Kayn's shadow assasin form back is his ultimate

For starters I wanted to thank you Riot for releasing a champion that I will probably main, he is super fun and versatile as he can be played, top (darkin form), mid (assasin form), jungle (both forms). I feel that when choosing your form these should be the deciding factors. Do I want more mobility and burst damage?—Assasin form. I want more teamfight utility, better dueling, and bulkyness? —Darkin form. Now that we got that out of the way lets run a quick analyzis between abilities of both forms. Passive — Assasin bonus magic damage based on the damage dealt, while darkin heals based on the damage dealt. I agree, that Darkin version may seem more appealing, but the bonus damage does help assasin form to do his job better, and makes him harder to itemize against. Q— Assasin form does flat dmg meaning its better vs squishies, while darkin does % health damage, allowing him to hurt bulkier targets, I would not change anything here. W— Assasin form more range on the ability, can move while casting, bonus ad scaling on the ability, so more damage. Darkin version — 1s knock up. I think both versions are good for each form at what they are supposed to do for them. E— Only changed for assasin form, better mobility and slow removal, not much to say about this one its nice addition to assasin. R— Assasin bonus cast range, does flat damage, and refreshes the passive. Darkin, does % health damage, and heals based on the damage dealt. I think this is where assasin form lacks the most. Rhaast version is really good honestly I wouldn't change anything on that, here are the problems with assasin version: 1)The base damage for it is really low and underwhelming. 2) Cast range increase is not needed, because considering you need to damage your target first, you are probably already on top of them. Ways I suggest buffing the ultimate for the assasin version :

1. This is borrowed from some other threads, but make assasin version an execute, based on how much % health your target is missing. That would mean his ult would still do close to no damage to targets that are healthy, and finish off the low hp ones.
2. Rather than increased range on the first cast of his ult, make the leap range on the second cast portion of it bigger, or make it reset the cooldown on his E, so that when he rips out of assasinated victim he would have a chance to get out.

Long story short, for those that did not bother reading my wall of text, I think the ultimate of Kayn's shadow form needs to be buffed, and he will be in a good spot.