Base on the champions you show, you can use this as your initial fire knight team

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This is a very safe team. Take note that Alure that I use here is at 229 speed. I am pretty sure Alure's speed can be a little lower but try to aim higher than this speed. 

I use Stag Knight instead of Ghostborn since you will be needing speed debuff on the boss. 

Stag Knight's speed debuff is more reliable than Krisk and Speed debuff on the boss makes the run safer. 

Note that all of the champions here are above 210 speed, and Stag Knight is in damage build.