This particular coven operates as a powerful and wide spanning enterprise focused on accumulating power to direct the world in ways that align with their interests. Witches gain more power through a dark ritual, which steals the life force from an unwilling victim and adds it to their own, making their magic stronger. Their physical forms also evolve, becoming higher life forms in the process. Rituals are usually performed in groups, usually of about 7 members of a coven, as the ritual is dangerous to perform and more people participating lessens the risks, with the drawback being that each witch gains a percentage of the power. say a victim has a power level of 50. Each of the 7 people will receive a portion of that divided equally.
Attached to each coven are soldiers or bodyguards. These carry out the tasks that require brute force or violence, such as war, or defending the coven from outside enemies. They also guard the witches while dark rituals are being performed. A coven of small amount of witches can have dozens or hundreds of soldiers protecting them, with bigger covens having more than smaller ones. These soldiers also grow in power as the witches in the coven increase their own. Their physical forms also change the stronger they get, becoming something other than human. The problem is how this is supposed to happen.
These soldiers don't have access to magic, and therefore can't participate in these rituals, yet I want them to become stronger, faster, and all around better fighters due to the groups in a coven performing them. However, covens cutting them in on the intake would deplete the sharing of power among their members even more than it already has, since the amount of energy one gains would be less the more it is spread out. With a large amount of soldiers all absorbing equal amounts of energy, the power gained eventually becomes negligible.
How can I get around this problem without making witches weaker?