——Servant summoning.
This is also a key research project of Chaldea, and the reason Akai Hinako agreed to Chaldea's invitation is largely because of this project. Thus, her mastery of Servant summoning knowledge is beyond question, with each step committed to memory.
If one were to summon a Servant using one's own abilities, it would undoubtedly require a rather complex magic ritual. However, since Singularities are equivalent to a special Holy Grail War, the difficulty of summoning has consequently decreased significantly. Even without a Master, a Servant can spontaneously be summoned...
Chaldea's ability to reach this stage owes much to the help of those Servants.
Every Singularity has heroes fighting alone, persisting with unyielding courage, resonating with the last Master protecting humanity, often creating miracles.
