Making a pact with ten beasts created by "Creation of Blood and Life" is equivalent to making a pact with a single ordinary beast.
It won't significantly affect one's sense of mystical patterns through their own spiritual power.
Any powerful faction, when cultivating their direct descendants, wants the Guardian Beasts they form pacts with to be Blood Beasts created by "Creation of Blood and Life".
This allows the direct line members of the faction to easily comprehend the mystical patterns in the initial stages.
Moreover, a Guardian Beast created by "Creation of Blood and Life" can continue to make contracts, even without acquiring external blood. The first beast created by "Creation of Blood and Life" can be used to nurture the following ones.
This is equivalent to a revolution in the history of beast-taming.