you guys ever played the mission of habd's remains? the lighthouse one where u need to place the remains of some guy named habds on the top of the lighthouse...well..on the basemant there's a giant charus..i swear..that thing is worse than a elder dragon..one shot from that thing can kill you..is that creature the strongest of all animals in skyrim?
But you don't have to jump down the ledge, you can used ranged weapons on the chaurus to soften them up. I think you can climb back up if you need to aswell.
Ancient dragon is tougher But anyways it shouldn't be much of a problem at a higher level, if it is just turn the difficulty down. It is a [censored] though.