Arelith

The acid damage from the Sassone Poison doesn't register in the combat log, and therefore kills with it give no xp. The Elemental Rime, in contrast, does register and gives xp on kills.

I know this has been a thing since the new poisons were introduced, so I'm not sure if it's intended behavior, but now that I've got an active poisoner and find myself preferring Rime over Sassone for just this reason, thought I'd check.

I believe I have identified the possible cause. Fix is in the works.