SMT: Syncronicity Prologue - 5. Black Frost perfect battle
4Black Frost is an okay final boss. Note that he is immune to ice and resistant to fire, so you have to fight this battle with Demoni-ho.
First phase is relatively easy. He has a set attack pattern and adds new attacks as you deal damage. His ult, just like Girimehkala's makes you switch between characters to avoid damage. Memorize the pattern and you'll be fine.
Second phase is a little more complicated. Here, you have to switch characters to null normal attacks. He still has a set pattern. His ult can be hard to avoid: you need to react at the direction from which explosions are coming from and rund to the opposite direction. The problem is, you may not make it. To avoid damage, switch between the characters, like usual, as explosions switch between fire and ice.