It’s a little disconcerting seeing Grim Reaper scaled to this degree. His old files only had him at 6.7m HP with high defenses and twice the damage power of all the other endgame bosses. The 35/F boss has less than half the HP and half the damage and defenses. IMC literally just overtuned the last fight like crazy.
The sheer magic defense alone will disqualify anyone that doesn’t have insanely high investments for reinforcements and transcendence. The wizard in the video is using a high transcendence orange 315 weapon. They also recycle the Reversi mechanic from previous floors here as well with mob swarm mechanics and two sub-bosses.
Solmiki is a pretty tough escapade on the way up, but it reaches terrifying levels at the last floor.
That Korean team did not have Stone Skin, interestingly enough. They have Ausrine, Missile Hole (two, just in case), and Revive as their defense assets. Somewhat surprising overall, but still good since it’s double Chronomancer.