I have a question about certain DK spells that use Runic Power. I'll use Dancing Rune Weapon as an example. Say that when you use Dancing Rune Weapon, does it immediatly consume 100% of your Runic Power, and set the duration of the spell in stone? Or does it drain Runic Power per second after being used to sustain itself, and as long as you continue to gain more Runic Power, the spell can last longer than 20 seconds?