In the case that Lord Pumpkin is in his tower, it's suggested that you change into CPK gear. His tower can be found north on the Third Floor Hallway, shortly before entering the gallery that Alpheus Winterborn is found in. Spell-ups, reagents, and a form of at least 2 are suggested.
Lord Pumpkin can paralyze, so if you are fighting in CPK, don't wear anything you don't mind losing or have at least one other individual with you. Pumpkin can also silence, though he can be silenced, dispelled, and debuffed normally as well. If he is wearing his weapon, he typically doesn't hit hard, but can if he's using hand-to-hand. Killing Lord Pumpkin may grant you the Mark of Fear.
Lord Pumpkin drops a spellbook bound in nightblue leather and assorted items dropped by mobs in Winterborn Mansion.