Harry freezing a good portion of Lake Michiganusing a fire spell.
Elaine, having just slit her wrist after almost being driven to suicide by a grief vampire, manages to shake off her torpor and produces a lightning bolt so powerful it takes out the entire front of the building she's in.
John Marcone showing up in the Deeps with his private bodyguard AND a small army to help Harry fight various White Court vampires, regenerative ghouls and at least one person possessed by an Outsider.
And then we find out in Changes that the private army was made up of Einherjar.
Harry's entrance into the vampire conference in the Deeps.
A bit of explanation: one of the Big Bads who (thinks he) arranged the plot of the whole books is talking to the assembled White Court of vampires, saying how they can take out the minor magic-users among humanity with impunity. After all, who was there to stop them?
"If that wasn't a straight line, my name isn't Harry Blackstone Copperfield Dresden."
Harry then slams his staff on the floor, cracking a marble flagstone, making a sound like thunder, and creating a carpet of rolling fire. Harry strides down the aisle behind this fire, Ramirez at his side, and calls out the villains of the piece for their deeds, ending the display by challenging the two culprits to a duel to the death. Bad. Ass.
I lifted my staff and slammed it down on the floor, forcing an effort of will through it to focus the energy of the blow into a far smaller area than the end of the staff. It struck the stone floor, shattering a chunk the size of a big dinner platter with a detonation almost indistinguishable from thunder. Another effort of will sent a rolling wave of silent fire, no more than five or six inches high, down the tunnel floor, in a red carpet of my very own.
I strode down it, Ramirez beside me, the fire rolling back away from our feet as we went, boots striking the stone together. We entered the cavern and found it packed with pale and startled beings, the entire place a wash of beautiful faces and gorgeous wardrobes - except for twenty feet around the entrance, where everyone had hurried away from the blazing herald of our presence.
"Vittorio Malvora!" I called,my voice ringing with wrath in the echoing cavern. "Madrigal Raith! I am Harry Dresden, Warden of the White Council of Wizards. Under the Unseelie Accords, I accuse you of murder in a time of peace, and challenge you, here and now, before these witnesses, to trial by combat." I slammed my staff down again in another shock of thunder, and Hellfire flooded in the runes of the staff. "To the death."
Note the uncharacteristic glee with which the narration explains how doomed they are: New Mexico made him angry.
Harry and Ramirez tag-team destroying (as in literally shattering every bone in his body) that sonuvabitchMadrigal Raith. Also, "Welcome, ladies and gentlemen, to Bowling for Vampires," which even got the vampires laughing.
Carlos deserves a huge amount of props during the whole Final Battle and the moments before. While The Reveal that Ramirez is actually a virgin leaves us chuckling madly, Carlos precedes to resist Lara enough to show the White Court Vampire he is not easily cowed and controlled, which actually goes to impress her. In the battle proper he shows himself just as Bad Ass in combat magic as Harry by using the most deadly aspect of water as his main offensive magic: erosion (which he uses as a Disintegrator Ray). And later after crushing Madrigal Raith along with Harry a wounded (A knife in his leg) Carlos proceeds to turn a bunch of Ghouls that were gaining on The Cavalry into mush (this in particular impressed Harry quite a bit). As Carlos himself puts it: “It hurts to be this good!"
Not to mention that Carlos reveals he has also put two and two together and like Harry and McCoy has guessed the existence of the “Black Council” by being Genre Savvy
Murphy putting an armlock on Hendricks. That is all.
"Murph, pick on somebody your own size."
After using the lust generated by kissing Lara Raith to get them out of a blast zone, Harry begins listing off a series of increasingly costly demands as reparations for the damage inflicted by her house. At the end of it, he adds one final demand: "Some Listerine. I've got a funny taste in my mouth." Her reaction is priceless.
Shadow Lasciel's Heroic Sacrifice. Best of all, it leads in with a simple statement: