[Gateway103]

The trouble is he was using Version 2.02

In the older Version, you can get multiple royalty summons (kinda funny to have duplicate ones, I tried this out before and got 4 Queens with 1 duplicate). But there are supposedly only 3 Air Elemental Queens, they are:

Aella, able to summon Air Elemental
Nephele, able to summon Sylph
Thuella, most melee-combat queen, 4 attacks.

Similarly, only 3 Queens of Elemental Water, 3 Kings of Elemental Earth (one being a blood summon, Illearth), and 3 Kings of Elemental Fire (one being a death summon, Banefire) exist.

Outside of elemental royalties, other unique summons include 5 Arch Devils, 4 Heliophagus, 3 Demon Lords, 6 Ice Devils, and 3 Treelord.

-Gateway103