Once again they are having issues with what dragons types can breed this dragon (Ringbearer). I got a Dino dragon challenge in Bingo and received a Ringbearer twice trying to breed a Dino dragon using two Dino dragons.
If anyone is having trouble breeding this dragon try two Dino's. They may have fixed it already (I don't know) but I bred two Dino's about 5 times. Got a few forest/fire and 2 Ringbearers.