Don’t know if this has been brought up or addressed, but there’s a Sentinel in Act 9 Chapter 1 Quest 1 on a path where defenders gradually gain armor ups. The whole idea of the path is to bring cosmic champions and armour break them so that they don’t become invincible and also inflict plasmas on you. After Sentinel’s new buff, he is virtually unkillable on this path and completely negates the entire point of the nodes.