>>534378219
It's extra hard mode stuff. Baseline, they added Fatty (damage res rat extra enemy that faces the most ops) to IS3. Then aside that, they added A16-A18. Starting A16, you get a relic and extra post battle drops that let you Evolve your ops, removing rejections and buffing them instead. I'm on A17 right now and it feels great, you can actually play around the debuffs with those instead of simply getting kek'd, and even get rewarded due to the sanctuary and defensive stat ignore buff ops get for it.