v20 Update. Difficulty appears to be negligibly higher. The bosses have more HP but otherwise it should not be a problem if you beat the Trials the first time they came around. I’ve updated the embedded video below to show the new last level of the Trials.
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Good news, the bosses defense stats were brought back to rational levels.
There’s an example of Oberon reviving at the end of this video.
Here’s the last level, using an underpowered team of 4-star classic heroes. This video jumps straight to the boss wave.