Unable to trigger 3rd Susanoo phase

[お前の国には売らぬ]

I started a new game+ save and completed two runs on 45 but wasn't able to trigger the 3rd Susanoo phase in either run. Have the requirements changed? Is there a certain point in the story I have to be to do this?

I haven't done any quests at all or viewed any entropies, just jumped straight into runs

[WardPhoenix]

It's tied to the Elite-modifier entropy ; the one that said that Elites ennemies - aka bosses - of X phase(s) are upgraded. Put that modifier to the max to face Advanced Susanoo.

[DoubleDeputyD]

Completing the story gurantees you fight him as many times as you want when you activate the Ultimate Trial. As for Mind Training set bosses are upgraded entropy modifier to max to get him on hard mode.

[お前の国には売らぬ]

Originally posted by Ward Phoenix:

It's tied to the Elite-modifier entropy ; the one that said that Elites ennemies - aka bosses - of X phase(s) are upgraded. Put that modifier to the max to face Advanced Susanoo.

Thank you! I tried this just now and successfully triggered it. I still have not made any progress through the main story or viewed any entropies.