Hi looking for a manga don't really remember it that well it was a long time ago. I can remember a skill "Breathless Rush" that one of the characters used holding his breath and swinging a gigantic sword used it in some church I think. The main character at the end fought with his mother who was super strong. If anyone can help me I'll really appreciate it. Also pretty sure the MC was also a sword fighter. The main character was some type of an assassin or "fighter" used to take insane ammount of damage and still remain standing.

Hi anyone anything please? 🙂

Could it be "Jackals" : https://www.mangaupdates.com/series.html?id=3138

Yes that's it thank you very much! I had a hunch they were called by some animal (the "freelancers" ) name but couldn't remember it.