Napalmbeat and soulstrike are ghost element attack btw, not shadow.
I think we can all agree that all class have their strenghts and weaknesses, some are better fit for some type of combat than others. I do my best to balance the event with monsters that are a challenge to different classes. But I will not make the trials different per class, I like to keep it the same for everyone.
Since you know in advance and can decide which class you use and which trial you participate in, I don't think it's unfair.