__________________ "Happiness is a lie. Life is horror. The light is always dying all across the universe. The last star will flicker out someday, when it does, all that remains is shadow. And I will be its king!"'-Amahl Farouk
Dookus lightning can vaporize rock and metal and his TK can throw several tons casually.
__________________ "Vader's pulse and breathing were machine-regulated, so they could not quicken; but something in his chest became more electric around his meetings with the Emperor; he could not say how. A feeling of fullness, of power, of dark and demon mastery -- of secret lusts, unrestrained passion, wild submission -- all these things were in Vader's heart as he neared his Emperor. These things and more."
Round 1: Tenebrous, he was Plagueis' master after all
Round 2: Dooku, with Vjun amp he was not far behind Yoda, who is ROTS Sidious' equal, Plagueis superior by small margin and clerly Tenebrous superior
In the series, it was still powerful enough for the Jedi protagonists to be unsettled and have hallucinations, IIRC. And for some reason it grew more powerful in following years.