They're swapping "Invincible" bosses with a new type of endgame content called "Takedowns." I'm sure the Takedown events will have an Invincible enemy at the very end, but it's supposed to be a more developed type of raiding content. I'm excited for it.

The first one isn't in the game yet though. So we've got to wait a bit.

If you mean the raid boss I don't think they've added it yet

It does not exist yet.  No raid bosses, no Invincibles.

I found a pedestal while clearing out the map that leads to nothing, it just says interact so I'm assuming it's coming in an update.

Were is the Invincible boss That's at the end of every borderlands game I can't find it