Skraal ate the red bead and started feeling the changes in his body. The changes are easy to feel for Skraal. As an origin-level being, he can easily feel that his powers, his physical capability, and many other things have increased.
In reality, bone beads can be used as physical improvement items for other necromancers. At the very least, common necromancers have no origin.
But if a necromancer has reached the origin-level and chooses Necromancy Origin as his or her origin, they can control Bone Bead with mastery. This mastery, as expected, involves what they can get from bone beads. It is a simple but important thing. An origin-level being with a necromancy origin, capable of taking other improvizations from Bone Beads.
Other mages have similar abilities, though not to the same extent as Necromancy Origin, because Necromancy directly involves death and corpses.
In exchange, it provides a more significant source of power and change to the user.