This hive is controlled by a "Queen Mother sent" 'Royal Knight' (New caste).
This hive is permanently LOCKED to be allies to the normal hive, and vice-versa (meaning you can't hurt each other).
You can evolve to ANY caste as ANY caste when in the Royal hive.
Royal hive CANNOT hurt / damage marines
The Royal Knight has 3 abilities:
1: Invite to hive
2: Remove from hive
3: Psychic Projection
1st and 2nd are self-explanatory, need to accept the invite.
The 3rd being that the Royal Knight could make, in essence, a "Psychic Projection" for the xeno to practice on. Essentially, it spawns a brain-dead marine that has a light purple tint, that can be occupied by the 'Royal Knight' with light, medium, or heavy armor, and all of the basic weapons (SMG, Rifle, DMR, and Shotty) upon spawning.
Taking 'damage' from this Psychic Projection as a Royal-Hive xeno lowers your health, but upon reaching crit, you auto-matically regain all hitpoints and you get a message saying "You Died" ... I know, kinda dark-souls style, but still.