Sectors

Sectors are to AHT as Rings are to JToH. They have towers in them, and with the exception of Sector 1, you need a certain amount of towers to go in them. There are 9 sectors in total.

Beginner Towers
Catastrophic - Tower of The Absolute Lesson

Catastrophic - Tower of Terse Persecution

Horrific - Mentally Exercised Trials and Levels Facility

Unreal - Tower of Shortlived Times

Intermediate Towers/Citadel
nil - Tower of the Quest for Perfection

Why - Open Slot/Tower

No - Open Slot/Tower

No - Open Slot/Tower

DEATH - Open Slot/Tower

Why-Unimaginable - Open Slot/Citadel

Advanced Towers
HELL - Open Slot/Tower

TARTARUS - Tower of True Diabolical

TARTARUS - Open Slot/Tower

Omega - Open Slot/Tower (Soul Crushing)

Epementary Fermion
All slots are open.

Beginner Towers
Unreal

nil

nil

Why

Intermediate Towers
No

DEATH

DEATH

HELL

Advanced Towers
TARTARUS

Unimaginable

Unimaginable

Omega

Aleph-Null

DEATH-Aleph-Null - Citadel or Obelisk

Sectors 3-9
All other sectors don't have slots at all, but are still on the Sector Select.

Sector 3: Macromolecular Complex

Sector 4: Earth

Sector 5: Stellar Bubble

Sector 6: Supercluster Complex

Sector 7: Universe

Sector 8: Gigaverse

Sector 9: Altarca