The Champion Attribute is Tank, not...
Raid Boss.
Guys, if you're complaining about being unable to obtain immortality, I've got news for you: Everybody dies. Your job isn't to not die. Your job is to keep your carry from dying while disrupting the enemy team. That's all Tanks have ever been supposed to do. I know you miss the Metagolem meta, but give it a rest.
The late game raid boss does still exist. o.0
No, they're not immortal, but when they hit 5-6 items, you're going to have a hard time bringing them down before their team mops the floor with you.