There are two variations of Crystal Wyverns:
1) The Crystal Wyvern hier is a highly aggressive variety of Wyvern that spawns in that Wyvern cavern on the Isles, they are untameable but you can get primal crystals from them, they also spawn in the Wyvern Queen fight.
2) The standard Crystal Wyvern can spawn in the sky above areas that match their variety they can be tamed PASSIVELY with crystals and Primal crystals.
How come these are breedable but normal wyverns are not ? You literly steal the egg of a normal wyvern so it would make a lot more sense if they where both breedable or just the normal wyverns where breedable.
Ok. Crystal isles is coming out on PC and console on June 11th. PC is getting the full thing, and console is getting part of it. Idk when the other part is coming out, but that's what I know about crystal isles