It was a Siptah exclusive for awhile (it only dropped on Siptah, not that you had to own the Siptah dlc to spawn it).
This one personally finds it somewhat useful, and it is a go to for agility builds that prefer AoE to the single target damage of Gatorbite. but Execution has proven an unreliable trait during several updates.
The Blackblade also inflicts cripple, for what it’s worth.

The nitty gritty, assuming execution operates during any given build, is if it will trigger with enough of a margin to reduce the number of attacks needed to kill an enemy as opposed to higher raw damage of the Blackblade. Which means it is usually only advantageous against bosses.

Has anyone checked to see if it works on the Sacred Hunt monsters?

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