Normally players may retreat from boss rooms by either using teleport crystals or leaving the room via the door if they can reach it safely as bosses never leave the rooms they reside in.
Sao floor 75 boss.
The last hurdle before you can encounter the region boss pretty much like a floor boss from sao is to prove yourself.
After this nothing seperates you from the region boss.
So now a quick explanation to the raid options you usually get offered.
As a member of the aincrad assault team your goal is to reach the 100th floor in sword art online.
Upon all players leaving the room which results in the boss disengaging from its aggressive state all damage previously dealt to the boss.
The skull reaper ザ スカル リーパー za sukaru rīpā was the boss of aincrad s 75 floor s labyrinth in sword art online.
The 74th floor s boss room that doubles as an anti crystal area.
After beating him aincrad was destroyed and floors 76 100 were still untouched.
The skull reaper was a very large boss that resembled a skeletal centipede with an elongated skull for a head and red shining eyes.
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At the end of the aincrad arc kirito faced skull reaper boss of the floor and found out that the guild master of the knights of the blood was the gm himself.
At the end of the fairy dance arc kirito restores aincrad so the people can explore it again.
You get it from killing the brutal kobold whelp and elder at this location.
The majority of the creature s bones including its arms legs and rib cage functioned like scythes.