It should be a challenge, but is another massacre!!!
I did it 4 times in Legendary (tried the different finals after finish the campaign) and did not have a single causality!
With the Rebuke Boom Blaster barrage we can almost destroy all Gatekeepers and most of enemies are “normal” ones, very easy to kill.
It would be nice much more enemies, at least FOUR Scyllas instead two, more snipers, and all enemies should be Praetorians. ALL of them. This is the Final Mission and they are guarding the Yuggothian Entity!!!
Besides that, Scyllas, Arthrons and Sirens are armoured enemies, should be much more resistants to blaster explosion damage to avoid the overpower of be smashed before even play by the Boom Blasters player barrage that can send 3 explosives by soldier (2 grenades + 1 missile)
Canny Official Feedback Tool topic:
https://feedback.phoenixpoint.info/feedback/p/last-mission-is-to-easy-spoiler