Real Life Band like Pentakill

Look up any of Jorn Lande's stuff. He is the vocalist for Lightbringer. The First two Masterplan albums were what sold me on him. He also did 3 albums with Russell Allen, the vocalist for Symphony X. He has also done a number of guest songs as well as side projects and several solo albums.

"Enlighten Me" - Masterplan https://www.youtube.com/watch?v=rGqa2IcD4oU

"Judgement Day" - Allen Lande https://www.youtube.com/watch?v=E60LkuqedMc

"The Scarecrow" - Avantasia https://www.youtube.com/watch?v=LTyxnUZMA1k

If you are a fan of Deathfire Grasp (I know I am), check out Dragonforce. I'm almost positive the original vocalist for Dragonforce, ZP Theart (he quit the band in 2011) is the vocalist for DG. Sounds just like a Dragonforce tune.

Sabaton is another great band that fits into the same genre.

Primo Victoria - https://www.youtube.com/watch?v=IrJAwCBbnuc

Into the Fire - https://www.youtube.com/watch?v=lCfTl1BwdyM

Into the Fire (Live) - https://www.youtube.com/watch?v=HgP_vfDWCJc