Question Regarding Completion Of Dungeons

let's say i slapped down a mob totem on the 4th phase of the eye, causing the eye to spawn multiple times.
will the dungeon be completed after killing only one of them, or will i have to empty the room of the bosses before the dungeon is completed?

the reason i was asking is cause i was thinking of doing a challenge run, but it would be pretty lame if it was completed after killing only one

note: if this would be considered bug abuse please tell me so i don't actually do this (although it isn't exactly abuse, but still please tell me)

 

If I were you I wouldn't do it, as it may be considered against the rules (toteming bosses), although I am not sure ifit is even possible.

You can try and if it happens you would fill a big report.