Give Tahm Kench a new ult

I feel tahm inst really that good at his roles those being support and top. As support all he does is eat his carry and in top he can 1v1 most champs if your good at him but i feel his ult is kinda bad compared to other tank champion ults like . Tahms ult is similar to ryze and twisted fate but they can tp a whole team or give vision of the map and all kench can do is move one person. i feel in order to make him like other tank champs or other tank bruisers they could either give him a aoe slow or cc of some sort or they give him a steroid ult which would make more of a top laner which is fine. My ideas on these ults would be the aoe cc could be he summons a massive river or a pond where every enemy champion is slowed and damaged. then with to steroid ult they could make him more like a demon and give him a auto attack speed and oh-hit effect or make it to where he gained more resistances and damage over a certain duration like . i feel that these ults could be much more useful to him and his team than his current ultimate,