Symphonic metal concepts

[HadesRhythm]

Greetings.

I'm very very curious about symphonic metal concepts, as I like bands like Nightwish, Epica, Anorexia Nervosa, Leaves' Eyes, Dimmu Borgir, etc. I know all of them are symphonic metal bands, and all of them use symphonic elements, but I'm curious about how guitar (and riffs) work in symphonic metal.

See this video : https://www.youtube.com/watch?v=0DkUiDzCQms

When he plays "Symphonic Metal", it sounds very harmonized. How can I get this harmony? by using two guitars or special effects?!

 

[HadesRhythm]

Any ideas? :/

 

[dirtfarmer3]

E- Guitar tablature for a D# Octave Chord
B-
G-8
D-x
A-6
E-

It's called an octave chord, simply keep the same shape as presented above and move it to the appropriate fret