Awesome idea for yorick rework!

It just hit me. Yorick could have the 1st 1hko Ult in league! The idea is, yorick as a gravedigger could try to "bury" someone alive, the ultimate could be called Entomb. So how the ult would work is that yorick can target a champion and put the champ on stasis, and while the champ is on stasis (being burried alive) Yorick goes on stasis BUT still being able to take damage(but he is immune to cc). And the ult would have a 5 second channel, if the channel ends, BAMB one shot, Offcourse this is a bit unbalanced. So yorick would be only able to Entomb the target if their are "witnesses" For example you can only ult the target if there is a nearby enemy ally nearby and the ult channel will increase depending on how many witnesses there are. Offcourse this would still be unbalanced, so to fix this, yorick may only be able to entomb the target for a 1hKO if he has more max health then the target, if he doesn't, he will deal his max health as true damage to the target. This will make the ulting the tank a little more tricky. And a little more details.

• Yoricks ult will get canceled if he enters a threshold of his max health 40% 35% 30% depending on rank.
• Yorick will gain magic ressist and armor on channel depending on how many nearby ally's 15 20 25 on rank.
• Yorick cannot cast his ult twice on the same person in a row EVER.
• If Yoricks ult is not in cooldown, He receives lifesteal depending on rank, So his ult is somewhat relevant in 1v1 lane.

I find this idea unique, and it forces yorick to be a full tank so his ult can be super game changing in team fights. If i missed tweaks that make the ult super unbalanced sorry in advanced~! ty for your time.