They prevent access to the labyrinth until it is defeated.
Sao 100 floor boss fight.
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Unlike regular floor boss minions mid bosses grant a last attack bonus on defeat.
Is a boss class monster that impedes travel between the floors of a labyrinth tower or a boss class monster that supports the floor boss.
Compared to floor bosses they are much easier to defeat and just like floor bosses field bosses can only be defeated once.
Ruby palace 紅玉宮 こうぎょくきゅう kougyoku kyū was a red palace on the 100 th and final floor of aincrad in sword art online if the game had proceeded as planned this would have been the place where the clearers who had reached the topmost floor alive would have fought against the final boss heathcliff beating the game if they were victorious.