Supreme Summoner — a stage where power over blood and the moon is joined by a foreign force from beyond the boundary.
Door of Summoning: stretching out their arms, the bearer manifests a vague ghostly door, covered in mystical symbols, and summons to their aid beings from the depths of the Spirit world. There is one limitation, but a significant one — only once in a certain span of time.
A share of the authority of Summoning as such belongs to them as well, and in the charms of Moon and Darkness they remain an outstanding master. Their sense of smell sharpens to the point where they can scent and precisely identify the source of blood from a huge distance.
As a Third-stage Otherworldly, they respond to prayers within a certain radius.
The ritual of advancement to this stage is among those where a mistake costs one's freedom: one must find in the depths of the Spirit world special knowledge, closely tied to one's own past, present, and future and intertwined with the "Moon," and then by rite declare it as their True Name for mystical purposes.
The canon's warning is unequivocal: if you choose wrongly or find what is wrong — you shall become a slave of the "Moon."