Desert biome oncrystal isles is full of death by every wyvern imaginable. I recommend a huge gun, some grenades and a load of luck. Death rears iit's head from below. If you see it, it's already seen you and is putting your death before you can turn and high tail it out of thre area. Got slashed by 3 of them just trying toi Get out of their territory. 2 killer argies and blood in the sand gone in under a minute