So my question on DOING WHAT NEEDS TO BE DONE: on lex
DOING WHAT NEEDS TO BE DONE: Give Lex Luthor a power action and KO an adjacent friendly character of at least 50 points. When he does and as long as Lex Luthor is on the map, friendly characters can use Willpower.

So do I make an attack roll or just give lex power action and the character dies?

Just a power action.