Now lets put aside the other issues with this spell, like the delay in the explotion procc when you bring someone under 20% hp before 4 seconds is up etc and they heal back up above 20% and the explotion never happens etc etc, there are several issues with this spell.

But today I noticed that the execution-explotion while target is under 20% hp doesnt happen if the target is blocking, you can actually block the entire execution-mechanic. Intended? (i know every executioner except radiant destruction is blockable, but they atleast deal the dmg, if you cast endless fury on a blocker at 10% hp they take like 900 dmg lolz)