Is it me or does Darth Sidious make you seemingly invincible (figurativeley)?

There are ways to deal with him, of course. If your team has a healer in it then he needs to be at the top of your priority list for kills. Luckily he's pretty squishy, so this isn't usually difficult unless he goes ninja with the dodges.

If you don't have a healer, then you're probably running a hyper-DPS squad, and you can pretty much ignore him until the opposing team's glass cannons are gone.