Talk:Spring 2019 Event/@comment-32063645-20190526154604/@comment-37971548-20190526162432

I found a redditpost that backs it up.

It only appears when you reach a certain point on the boss's healthbar.

So until then, it's slow-chip grind fest after you meet the other requirements.

If you haven't done those steps, from what I understand you have to get Air Superiority at K and S-Ranks at J, T and S.

And to reach Node T, it looks like you need at least one AV and one slow ship (ex. Nagato).