I've been trying to get a gruffer sound with my singing but it always hurts my throat and I have to take a break after 1 or 2 songs. I'm sure I'm doing something wrong. Any advice or recommendations?

You're relying too heavily on singing from the throat as opposed to the diaphragm. Take a few basic singing lessons (or even look up instructions online) on how to sing traditional stuff. Those things should transfer into Extreme Metal vocals. Drink plenty of water when you're practicing.

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