Tahm is ridiculously unbalanced
An unkillable tank shouldnt be able to do 30k more damage to champs than any of his carries.
Just had a game where Tahm (top lane) built full tank. until the last 5 minutes or so he built a RoA. His damage at the end was 62k to champions. The closest behind him on his team was kindred & draven who both did about 30k.
Where is the balance in that? Try to kill him first, he survives so long his team kills you. Kill his team first, he kills you.
Also his q stun should use up the charges of his passive just like using devour does. No reason he should be able to stun you, walk up and eat you right away.