Dominant Conception
The pinnacle of the branch of Summoning Magic concerned with actual summoning of creatures, Dominants are known to be the aforementioned personalized Concepts, except these Concepts are created through a willing partnership with another being, typically of extraplanar relation. A Dominant and its summoner have vastly varying relationships, but share their power together, the Dominant being reshaped as per the Concept - though not entirely, for the being itself has a lot of say - while lending the summoner its power and vice versa.
Generally, the distinction between the two doctrines is that a Dominant Being is far stronger than a Memoria Being, but the relationship is just that, a
relationship involving both give and take, and not one of the summon mindlessly obeying its master or mistress with no discussion. Some Dominant relationships can be like that if that's the preference of all parties, but that's far from a given.
Memoria Shifting
Memoria Shifting is the doctrine of summoning concerned with changing the self instead of another being. It functions very similarly to Memoria Conception except for the fact that upon the refinement of a Concept, the terms of that concept are blended with the form of the caster to change it in a way that somewhat resembles the Concept.
Initially, these changes would be minor - clawed hands or feet, a set of vestigial wings, and so on - but as a
Summoner's mastery of both Memoria Conception and Shifting increases, the specificity of the shift can vary greatly, from precise shapeshifting of certain, controlled body parts, to a full shapeshift into the Concept.
Indeed, these techniques even function for the customized, personal Concepts, making Memoria Shifting a very potent combination for a Memoria Conceptionist, indeed.