The phrase "merciful end" means a kind and compassionate conclusion, usually used when referring to the end of a difficult or painful situation. Full definition
In that view of things, the killing of «defectives» took on the guise of putting a merciful end to lives that were only a pointless misery to those enduring them. (firstthings.com)
At last, Dr. Reese's diatribe came to a merciful end and we filed out of the auditorium, grateful to be able to focus on the tasty lunch provided by the university. (rachelheldevans.com)
Lent is a season of ascetic fasting, discipline, and preparation, but the merciful end is never out of sight, and she mastered that reconciliation of sober externals and interior joy in her own life. (firstthings.com)