Darth Sidious (The New Story.

Battle of Sundari
Sidious, having decided to confront Maul and Opress, went to Sundari by opening a shadow portal. He then easily killed several of Maul's forces and singlehandedly annahilated the whole force guarding the castle and confronted Maul.

Lightsaber Combat
Despite his old age and frail appearance, Darth Sidious was an immensely proficient duelist, the greatest Sith Swordsmaster of all time and one of the greatest duelists in history. During the Battle of Sundari, he was easily capable of slaughtering many enemies. When he duelled Opress and Maul one-on-one, Sidious merely toyed with them and yet still obviously easily was beating them. Altough Maul put up a far more ferocious fight in his last stand against Sidious during the battle, Sidious ultimately prevailed and disarmed him. Against Kenobi and Anakin, altough they had yet to reach full power, Sidious was able to fight equally with them both at once and would seperate them eventually. He then soon defeated Kenobi and overpowered Anakin even when he had the advantage of 2 lightsabers.