You can access the Enhance section from the Dimensional Vortex to level up your units. One chamber can be opened for free each day for 24 hours. Should you wish to open another chamber while this is open, 100 lapis will be required.

Choosing the Chamber of Experience is highly recommended for beginners. There are four levels:

BGN - Requires 5 NRG and is the easiest level.

INT - Requires 10 NRG and offers an intermediate challenge which yields more experience.

ADV - Requires 15 NRG and offers an advanced challenge which yields even more experience.

PRO - Requires 20 NRG and provides the most difficult challenge but also the most experience.