Do we know anything about those bosses? Aside from their location (Nerius being the 3rd Floor Boss and Whisge the 4rd Floor Boss). Apperance, skills, weapon of choice, last attack bonus... any information would be useful.
@General This is posted in the Q&A section, not the speculation or opinion sections. If you don't know the answer, then please avoid posting your opinion, since that's not what the person who asked the question wants.
@Eswald Neither Progressive volume 2 nor 3 are translated, so we can't answer your question, unless someone has read either the Japanese version or the Chinese translations. Though as far as I remember, C9 said that the third floor boss battle wasn't really elaborated on much.
I own Sword Art Online Progressive light novel volumes 2 and 3, in English. So yeah, translation was done. The third boss battle just said the monster poisoned them a lot, the elf commander warning them about that at the end of the elf quests on that floor, and that it dropped a lot of loot.