Won Ton's skill is primarily used for dealing mass AoE dmg and reducing the atk rate of all targets hit. It is very useful in slowing down many enemy heroes while defending a base. He is aground based melee unit with executioner mercenaries.
Due to his ATK based skill it is best to use equipment that boosts his ATK stat. An ideal weapon to be used would be the Holy Hammer as it has the additional benefit of boosting his Executioner mercenaries.