Where to find cabal champions in Destiny 2

There are currently two main reasons why you might be trying to hunt down the Destiny 2 cabal champions. One is for the strictly enforced generosity that Saint-14 can give you; the other is for the exotic quest for Devil's Ruin.

For the strictly enforced Bounty, the best place to go is the Sundial on Mercury. It is not even necessary to do a sundial run, because there should be a cabal champion out and about outside the sundial itself. When you show up, go through the steps and you shouldn't have a problem finding it. Cabal champions are fierce enemies, so be sure to carry hard-hitting weapons like hand cannons, shotguns, and rocket launchers, and you'll do a quick job of him.

If you don't have access to the Sundial, then any night ordeal at 920 Power or higher involving the Cabal will also give you champions.

Devil Ruin research is a bit different. The research wording is somewhat misleading. While he tells you that you must kill the Cabal Champions in the Sundial, you must finish a race and beat the last boss, as this is the only enemy in the Sundial itself that counts as a Champion. You can run the run with normal difficulty, and once completed, you will be able to start the mission.

Bungie occasionally has clarity issues in Destiny 2 when it comes to wording some missions and bounties, but once you know where to go and what to do, it doesn't take long to get the new Devil's Ruin Exotic Sidearm.