Appearance & Biology: As the name would imply, the entire Sisterhood is female (though excessive male hormones have led to some being androgenized). They are genetically derived from baseline humanity; all Sisters are cloned from less than a hundred genotypes, but they are further modified for certain caste functions. Most appear as roughly baseline humans, but their are hypertrophic muscled shock-troops, vacuum-adapted space-sisters, and ambigenitaled comfort sisters.
The most heavily modified Sisters are perhaps the queens (or "mothers"): macrocephalic beings, whose vast brains allow them to monitor every aspect of hive function.
Society: Only one Morrgna hive exists currently, a moon-sized artificial habitat with a single queen, but in previous times the Sisterhood was more expansionistic and sent out war wombs to generate hives on numerous worlds. Most of these were destroyed in conflict with other cultures; some fell to inter-clade strife.
Stats: The Morrgna Sisters have the same stats as baseline humans, though based on caste, their actual stats may vary wildly.