It works the exact same as is3, you only have to beat ending 1/2 before moving on to ending 4 in floor 6. In this run I deliberately got ending 4 relic on floor 6 to force ending 4 on floor 7, more or less just as a for fun thing. You don't have to do this at all in a normal run, just do it at floor 6.
![[Arknights] IS#4 Difficulty 15 Triple (2/3/4) Ending feat. Degenbrecher](http://i.ytimg.com/vi/F90lS5aDMyA/mqdefault.jpg)
![[Arknights] IS#4 Difficulty 15 Triple (2/3/4) Ending feat. Degenbrecher](/img/tr.png)
![[Arknights] IS#4 Difficulty 15 Ending 4](http://i.ytimg.com/vi/ilsYMMaT4Vs/mqdefault.jpg)
what endings do you have to do for ending 4, do you have to only do one ending boss or do you have to do two before you can go to the floor for it
It works the exact same as is3, you only have to beat ending 1/2 before moving on to ending 4 in floor 6. In this run I deliberately got ending 4 relic on floor 6 to force ending 4 on floor 7, more or less just as a for fun thing. You don't have to do this at all in a normal run, just do it at floor 6.
peak kroos syncing with music during chapter 12 stage on floor 2