Here's just a custom fight for the Headless Horseman... it doesn't really follow what he SHOULD use.
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Note: This is a modifyed version of Zerglords Anoziar the Great script. He said to someone in his thread that they could modify it... assume that we all are allowed to =)! Now, down to bussiness, this MIGHT seem like an overpowered fight, so you probably need a raid if it's for normal player's. The Horseman will cast a Holy Nova spell every seventeen second's, a Lightning Discharge spell every thirty-five second's, a Shadow Nova every twenty second's, an Arcane Discharge every thirty second's, a five second Enrage every fourty-five second's, and the spell Arcane Barrier every thirty second's. I have been tinkering around with my SQL for the Horseman, so I've made him have 250,000 Health ^_^! So, tell me what you think?
Edit - Oh, almost forgot to tell you the ID to spawn the Horseman! It's 500000. =)!