This was probably the most difficult stage so far, predictably so with it being a Hell House with more HP. Using Zack would have mad it easier but I wanted to save him for later.
First half of the fight is just using a somewhat half-hearted Tifa Force Time without her BT effect to build up to 999% by the end of it. Noctis and Aerith keep their BT effects up throughout the whole fight from the beginning to allow for some good follow-up damage as well. Crystal Ability Speed helped with this to give Tifa more turns and delete a bunch of Noctis' turns.
I got the Hell House into it's second phase for when I start my second Force Time, and reapplied Aerith's Seal Evil debuff to prevent the Hell House from buffing at it's thresholds, and also placed a Keiss LDCA for Tifa's Burst phase powered by a Cid Raines LDCA.
While I only went into the Burst phase with 4 turns, they were all at 999% and so I was able to do a lot of damage and finish off before the Burst phase ended.
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