It is in the Corrupted Strike. This is absolutely not the real way to get there but it's the path we used. The real path is quite obvious but right now it's an instant kill volume. All three classes can make this jump though warlocks may have to pop super.

Emphasis mine. It’s a time-gated thing, something Bungie hasn’t flipped the switch on yet. I know Bungie can’t just put all this stuff in the game and let people find it as they will—everything would be found within a week. But time-gates do sort of bother me, especially when they try and play all coy like “you’ll just have to find out.” Which, to be fair, they haven’t done with Malfeasance as far as I’m aware.

If you haven’t been reading the Drifter lore, you really should.

The thing is… I am not exactly sure how I am unlocking some lore. Sometimes it will just pop up saying I unlocked some lore during the course of a gambit match, sometimes after.

So much of the lore is ???????????

…which is fine, but it should be super obvious when you unlock it HOW you unlocked it so I can go about unlocking more.

In any case, Callum’s Grave will have something to do with the Malfeasance quest. The grave has now been found (with nothing to currently do—likely we’re still time gated until Bungie fires the quest up).

This is really cool, and exactly the sort of lore in the game I love to see.