To make Generate Dragon Portal, combine Megalodon Tooth, Tyrannosaurus Arm, Argentavis Talon, Sauropod Vertebra, Tusoteuthis Tentacle, Artifact of the Hunter, Artifact of the Pack, Artifact of the Massive, Artifact of the Clever, Artifact of the Skylord, Artifact of the Devourer, Artifact of the Immune, Artifact of the Strong, Artifact of the Cunning, and Artifact of the Brute. The Generate Dragon Portal unlocks at level 90