A floor shift is one of the many strange phenomena within the void dungeon.
When a floor changes in a way that defies its usual structure, it's called a floor shift.
These shifts can be temporary or, in rare cases, permanent, though the latter almost never occurs.
What changes during a floor shift is unpredictable.
It could alter the terrain, the void creatures inhabiting the floor, or even the floor boss itself, which in some cases may become significantly stronger.
But why does this happen?
No one truly knows.
Some theorize the void dungeon is a living, sentient void creature, reacting to the intruders who invade it.
Others believe that a floor shift is a sign of the void dungeon's anger, a retaliation for the disturbance.
There have even been instances where a higher-level boss spawns on a lower floor, seemingly to eliminate the humans that have ventured too far.