Mystic have access to the following alternate class features.
While most mystics receive powers closely aligned to their
connection, a few receive glimpses of supernatural insight that
allows them to access different powers. Among mystic scholars,
such an insight is generally known as an epiphany. Whenever
you would gain a connection power, you can choose an epiphany
of equal or lower level instead. For example, when you gain your
3rd-level connection power, you can choose any 1st-level or 3rdlevel
epiphany instead of gaining that connection power.
If an epiphany allows a saving throw to resist its effects, the DC is equal to 10 + half your mystic level + your Wisdom modifier. If the epiphany requires an enemy to attempt a skill check, the DC is equal to 10 + 1-1/2 × your mystic level + your Wisdom modifier.
For more info click here.