If you make your base on the south side of the wyvern heir nest on crystal isles and one of these bad boys spawn at your base I have no advice but to abandon all hope and let it destroy everything you own because it will kill you and everything you own unless you have something rediculesly strong (btw these things spawn south of the crystal heir nest in the desert on crystal isles so now you know where not to build or where to find one)
If one is encountered near water, you can simply lure it out to sea with a flyer and it will swiftly drown. Given the water is deep enough. If encountered inland not near water. Pray to the overseers you have something fast enough to out run it. Then promptly die because they're as fast as a mad Hispanic mother with a shoe. Not as deadly as one though.