Let’s compare M Final Stop with M Zolhan’s Revenge.
M Final Stop is alround weeker than M Zolhan’s Revenge.
Physique, cunning and pierce resistance on Z shield can save 2 MIs which are meant for OA/DA. You can change these 2 MIs for Legendary items to get higher %retal damage. For example, Ugdenbog Girdle to Sash of the Immortal Sage, and Creeping Ring to Sethris. By this way, the difference bewteen the two shield is much more than 300 flat and 10% retal damage. Totally it’s like 300 flat and over 100% retal damage.
Besides, Physique and cunning also provide health, so the 880 health on F shield is not a significant advantage over Z shield.
The 35% Stun resist on F shield is also some trash. A physical Retal WL would definately choose Shield Maid devotion and Menhir devotion, and Decorated Soldier skill. These three make up over 70% stun resist, so stun resist on F shield is definately some trash.
The 20% armor seems to be the only reasonable one, but nowadays a Hound devotion can provide 15% armor, so 20% turns out not attractive at all.
Let alone skill points, skill modifier and granted skills.
In conclusion, M Final Stop is some trash! It needs a major revision.
I would suggest removing armor and stun resist, adding tons of AS and some resist, increasing flat physical retal to 1600-2400, adding a 120 degree modifier to Smite, and change the granted skill to proc on hit with 1.5s cd or proc on hit with 3-5 target. Then some balance work could be done in PTR. Otherwise this shield will remain a trash that no one picks.