What slots are still open?
AncientBeetlemon (AncientBeetmon): Warrior of Thunder, consist of Beetlemon (Human) and MetalKabuterimon (Beast).
AncientMegatheriumon: Warrior of Ice, consist of Kumamon (Human) and Korikakumon (Beast).
AncientVolcamon: Warrior of Earth, consist of Grumblemon (Human) and Gigasmon (Beast).
AncientTroiamon: Warrior of Wood, consist of Arbormon (Human) and Petaldramon (Beast).
AncientMermaimon: Warrior of Water, consist of Ranamon (Human) and Calmaramon (Beast).