Guild Wars 2

How do these traits interact? Do you just make conditions disappear every 3 seconds? Do you still get the Life Force?

Depends on how their proccing is lined up. But they’d function the same as you’d expect, Shrouded Removal will proc every 3 seconds to remove a condition, and Unholy Martyr will trigger once every 3 seconds to take one condition from an ally and transfer it to you, giving you 7% LF. The only question would be whether they coded their specific order of proccing in a way that UM always procs first, drawing the condition, with Shrouded Removal always proccing second so that it can then remove that condition immediately. To that end I’m not sure, but it’d be easy to test with 2 Necromancers, one using BiP and the other with UM/SR.