Ornstein is the captain of the Four Knights of Gwyn, and the leader of Gwyn's knights. To slay the dragons, he wields lightning power and imbues his Dragonslayer Spear with it. Despite his large size he is extremely agile, using his spear and projectiles to reach great distances with his offensive onslaught.

Homing Lightning bolt: He will charge the bolt over his head and shoot a bolt that moves very slowly and homes in very well. The damage happens roughly when the middle of the bolt hits you and not the spear's tip.

Lightning Bolt: He will charge the bolt at waist level and shoot a bolt that moves straight, does less damage, and is much quicker.

Lightning Lunge: This move looks nearly identical to the aforementioned quick lightning bolt move when he is preparing to use it, at waist level.

Charging Stab: similar to the lightning lunge, however this goes much farther and homes in. With this move Ornstein will move across the room very quickly, and can cause your lock-on to be lost.

Lunge: short range version of the above attack which he uses when you are mid-close range away.

Various spear attacks: Ornstein also has various spear attacks, which are similar to an enemy wielding a large two-handed weapon: big left to right and thrusting attacks. He is vulnerable at this time, assuming you can dodge/block his attacks.

Additional second phase attacks:

Lightning Stab Attack: Ornstein will charge his spear with lightning and stab you with it. If hit, he will skewer you, lift you up, and shock you with lightning.

Butt Slam: This lightning-charged butt slam has high damage and AoE range.