Oh, I thought they have spoken about the vanilla egg, I wasn't aware that it does have the the dragon mount mod. You can indeed change the ID of the dragons mod: Code: # Overrides the entity ID for dragons to fix problems with manual IDs from other mods. # Set to -1 for automatic assignment (recommended). # Warning: wrong values may cause crashes and loss of data! [range: -1 ~ 255, default: -1] I:dragonEntityID=-1 Issue fixed now.