Talk:Winter 2017 Event/@comment-25938809-20170226174503/@comment-99.232.128.65-20170226185600

I just kept doing it until I got a Green T

Also send all four LBAS to strike it + Boss Shelling Support if you aren't already. The rest is luck

But the two guys/gals above are right, you can clear without the S-Rank debuff