The rest of the monologue by Winds Come Darkly and introduces Saber’s iconic anima banner. For those who don’t play Exalted, when a Solar uses a large amount of energy (magic, Essence, motes), they light up in a glow. At a certain point, they have a huge iconic display which kind of gives their personality or Exalted nature away.
Death of Obsidian Butterflies is a spell in Exalted that affects a 30 yard by 100 yard area with a ton of sharp, killing butterflies made of obsidian. It is room-clearing spell, but takes a bit to get off, hence Saber telling Glorious to guard. The little speech isn’t canon, but a nod toward the Dragon Slave from Slayers.
The sorcery font was Blambot’s and, not that you probably notice, it is rotating from frame to frame. 