User blog comment:HylianMoon/STOP DELETING UMBRAKINESIS PAGE!/@comment-24028334-20140322143143/@comment-98.237.162.125-20140322231604

It spreads at the speed light leaves. If you somehow slowed down light dark would slow down too because it'd take light longer to leave and therefor dark longer to spread, so as lamia said the speed of dark is the speed of light. Because light leaves and goes into something at the same time making it so dark spreads at the speedof light. I hope I didn't bother you with my statement, I just wanted you to have a deeper comprehension of how what they're saying works. Sincerely. ~SeanA