I don't think you have a team that can handle him unfortunately. You need champs with multiple-hit attacks, and you don't have enough of them leveled yet. I wouldn't try forcing it. Just wait until you pull some better multi-hit champs.
That how I was kind of feeling. Unfortunate. Appreciate the feedback.
So nothing really matters until you have a maxed champ, usually your starter, so that you can farm solo farm brutal 12-3 campaign with 3 food champs, to max food to max more champs. Using energy on FK right now is a waste of resources. Also taking a bunch of champs to 50 and 40 is also a waste of time and resources. So focus on building 5 star food champs to take elhain to 6 star and worry about FK later. https://9apps.ooo/
FK took me a while to get outfitted for. I had to be patient for a good time, myself. Finally got over the hump with Athel, Tallia, and Coldheart for the multi-attackers. Coldheart is the critical one for me with her heal reduction. Athel and Tallia could be replaced by just about anyone, but both have Relentless gear. My other two slots are Adelyn for the hp destruction heal, and a resurrect-toon.
The Fire Knight has a unique mechanic that makes him tough to deal with, primarily his shield and multi-hit requirement to break it.
Use champions with abilities that hit multiple times in one attack (Coldheart, Alure, Apothecary, and Bellower). This is crucial for breaking the Fire Knight's shield, which requires multiple hits to be removed.
Or bring champions that can reduce the Fire Knight’s turn meter. This helps in controlling the pace of the fight and prevents him from getting too many turns.
Also include healers or support champions to sustain your team, especially if your damage output is not extremely high.
Focus on using your multi-hit abilities when the Fire Knight’s shield is up. Coordinate your team to ensure you have enough hits to break it quickly.
Prioritize using champions who can attack multiple times per skill to remove the shield efficiently.
Once the shield is down, focus on controlling the Fire Knight's turn meter. Use champions with abilities to reduce his turn meter and prolong the time before his shield comes back up.
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Good luck, and may you earn that sacred shard!