If Black Metal and Power Metal were to ever have a child (gods forbid save this exception) it would be Ensiferum.
Ensiferum uses the melodies and choral arrangements without sacrificing the thrash and black elements.
Nothing is more evident than in their new album Victory Songs. With tracks such as the Wanderer and Victory Songs we see the professional and creative side of folk metal. With Ahti and Raised by the Sword we see the more hard-hitting skills that Ensiferum still possess.
The album is an awesome listen and I personally can listen to it all the way through without ever getting bored. Whether you are looking for original muscianiship or creative lyrics or both, consider this a perfect buy.