Derek Donais said this quote

Power surged through him: unfettered power, unimaginable power. It coursed through him and gave life to his maddened cry, feeding it, making it unnecesssary even to breathe. Deeper and deeper his screm became, until it was the primal voice of the very land itself. It was raw, searing. It was the energy of making and undoing, and he had unleashed it.