There is a piece of pure music called "Dangerous City", which is very suitable for the battlefield (although I think it is not suitable for lyrics)

大奥メインテーマ (the middle section, I think it sounds majestic)

Ning Yue (very desolate feeling)

Thousand Years of Elegance

Hyakki Night Journey - Prologue (I think this is good)

はるかな游 (This is a lot People know it, although I don’t think it’s suitable to write lyrics)

大きな爱に包まれて

Tsurugaoka’s Determination~Revenge

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lz I don’t know if Fu meets your requirements. In fact, I think sometimes the same music sounds good in different environments. It’s different, so if you really can’t find music that suits your needs, then you should put more effort into writing lyrics and singing in the later stage! Then choose a piece of music that is lighter and more in tune to highlight the singing part.