Crystal wyvern easy passive tame. If server allows, run onto its back between the shoulders and feed it crystal in your last slot with [e]. On it's shoulders it will be less likely to drop you. Carry food and drink, have a flyer on follow if you can, and parachutes just in case.
There are 3 variants of the crystal wyvern. The tropical one gets the hydrated buff( more damage, resistance etc) when standing in water like a spino. Even though it gets the buff in water it can’t swim and is found in the white shores area. The blood one breath steals the life force and heals while using it breath attack and is found in the forest with the red trees. The ember crystal wyvern is found in emberfall. It’s breath is more precise and can go further than the normal fire wyvern breath. The breath also has a rage meter with the more you use it the more damage it does. Eventually it will start to get blue flames in the mix. Hoped that helped you
U can get the primal cristal by knocking them, once u knock them just pick it up from their back.
Best way to tame is to jump on its back and feed it, u'll get a free ride and an easy tame ( take a parachute in case )
Primal Crystal DOES NOT spoil slower in preserving bins or refrigerators. ONLY CRYSTAL WYVERNS CAN SLOW THE SPOILAGE. Simply put them in their inventory. With that being said, it is best to get taming immediately after gathering the primal Crystal.